5e Companion (Half-Elven Warlock of the Seeker Pact)

The patron for this character has been called "Edan tuulo' i luin minas." They appear to be human but has had numerous faces over time and a mercurial personality that has ranged from near pacifistic to scheming and manipulative. However, no matter what guise the Man from the Blue Tower appears in, he (or occasionally she) has always encouraged curiosity, innovation, and courage. Though he often seems just the slightest bit disapproving of mortals from time to time, he certainly has shown a love for them and empathy for their trials.

Yes, this theoretical build is basically a Companion for the Doctor

The focus of this character is going to focus on the ability to learn things for the most part. Expect a lot of spells related to removing conditions, divining things, traveling places, and the like. The Half-Elf race might not so much represent a race as it does the fact that via exposure to the Doctor the character has been given much better medical condition and seen a wider scope of reality than most, separating their nature from the rest of humanity just that little tiny bit.

That or they're a half-elf the Doctor picked up.

As usually, using the 15, 14, 13, 12, 11, 10 array worth 30 pts that I prefer to use when doing theoreticals.

1st Level Half-Elven Warlock of the Seeker Pact

Str: 10

Dex: 12

Con: 12

Int: 14

Wis: 14

Cha: 17

HP: 9

AC: 12
Save DC: 13

Speed: 30 ft

Proficiency Bonus: +2

Darkvision 60 ft
Fey Ancestry

Skill Versatility

Armor Proficiencies: Light Armor

Weapons: Simple Weapons

Tools: Guitar

Saving Throws: Wisdom, Charisma
Languages: Common, Elvish, Celestial, Draconic

Proficient Skills
Arcana (Warlock) +4
History (Half-Elf) +4
Insight (Far Traveler) +4
Investigation (Warlock) +4
Perception (Far Traveler) +4
Stealth (Half-Elf) +3

Background: Far Traveler

Otherworldly Pact: The Seeker

Pact Magic

Shielding Aurora

Cantrips:  Prestidigitation, Toll of the Dead

Spell Slots: 1 (1st)
Spells: Hex, Sense Emotion

Equipment
Leather Armor

Arcane Focus
Cane (Club)

Scholar's Pack

Two Daggers

Reasoning: The character is reasonably intelligent and willful while having a very strong personality. A caster should have a combat spell, so I went with Toll of the Dead due to the special affect being sound based, a bit thin, I know, but it is a bit amusing and Whovian in a way for random bell noises to cause necrotic damage. The spell choices cover both the Doctor's ability to vex his enemies and his empathy which sometimes carries over to his Companions. Eldritch Blast is far to direct and obvious to really fit someone who is emulating the Doctor a lot of the time. (I say this and yet a number of the Doctor's Companions have been known to pick up a gun or other weapon). Most of the possible backgrounds fit at least one of the Doctor's Companions, so I went with Far Traveler which covers a wide range of things.

2nd to 5th Level

2nd Level - Eldritch Invocations: Seeker's Speech, Beguiling Influence, +6 HP (15)
Spell: Healing Elixir

3rd Level - Pact of the Star Chain, +6 HP (21)
Spell: Suggestion

4th Level - Ability Score Improvement: +1 Cha, +1 Int, +6 HP (27)
Cantrip: Minor Illusion
Spell: Protection from Evil and Good

5th Level - Proficiency Bonus: +3, Invocation: Eyes of the Rune Keeper, +6 HP (33)
Spell: Counterspell

Reasoning: I'm hitting a lot of the information gathering stuff. I also hit Beguiling Influence here to add a few more skills. Healing Elixir provides some limited healing ability. Counterspell is good, I'm likely also going to pick up Dispel Magic and Remove Curse. While I considered Comprehend Languages and Tongues, Seeker's Speech and Eyes of the Rune Keeper cover almost all of what those spells do.

5th Level Statistics

5th Level Half-Elven Warlock of the Seeker Pact

Str: 10

Dex: 12

Con: 12

Int: 15

Wis: 14

Cha: 18

HP: 33

AC: 12
Save DC: 15

Speed: 30 ft

Proficiency Bonus: +3

Darkvision 60 ft
Fey Ancestry

Skill Versatility

Armor Proficiencies: Light Armor

Weapons: Simple Weapons

Tools: Guitar

Saving Throws: Wisdom, Charisma
Languages: Common, Elvish, Celestial, Draconic

Proficient Skills
Arcana (Warlock) +5
Deception (Beguiling Influence) +7
History (Half-Elf) +5
Insight (Far Traveler) +5
Investigation (Warlock) +5
Perception (Far Traveler) +5
Persuasion (Beguiling Influence) +7
Stealth (Half-Elf) +4

Background: Far Traveler

Otherworldly Pact: The Seeker

Pact Magic

Shielding Aurora

Eldritch Invocations: Beguiling Influence, Eyes of the Rune Keeper, Seeker's Speech

Pact of the Star Chain

Cantrips: Minor Illusion, Prestidigitation, Toll of the Dead

Spell Slots: 2 (3rd)
Spells: Counterspell, Healing Elixir, Hex, Protection from Evil and Good, Sense Emotion, Suggestion

Equipment
Leather Armor

Arcane Focus
Cane (Club)

Scholar's Pack

Two Daggers

6th to 10th Level

6th Level - Astral Refuge, +6 HP (39)
Spell: Sending

7th Level - Invocation: Dreadful Word, +6 HP (45)
Spell: Remove Curse

8th Level - Ability Score Improvement: Skilled: Intimidation, Nature, Survival, +6 HP (51)
Spell: Dispel Magic

9th Level - Proficiency Bonus +4, Invocation: Path of the Seeker, +6 HP (57)
Spell: Scrying

10th Level - Far Wanderer, +6 HP (63)
Cantrip: Eldritch Blast

Reasoning: Decided to go ahead and put Eldritch Blast in because, well, laser beams and such. I'm sure the Doctor will be very disappointed. The other spells selected cover the Doctor's tendency to go around and trying to undo the problems left by other people as well as being able to send messages and look upon things. Dreadful Word allows for the use of Confusion occasionally and Path of the Seeker makes it really hard to restrain this prodigy. Skilled just provides more skills which goes a lot with the omnidisciplinary nature of someone following in the Doctor's footsteps. I considered adding Thieves Tools with Skilled, but you can pick it up in downtime activities and Survival seems a  bit more appropriate to a far traveller.

10th Level Statistics

10th Level Half-Elven Warlock of the Seeker Pact

Str: 10

Dex: 12

Con: 12

Int: 15

Wis: 14

Cha: 18

HP: 63

AC: 12
Save DC: 16

Speed: 30 ft

Proficiency Bonus: +4

Darkvision 60 ft
Fey Ancestry

Skill Versatility

Armor Proficiencies: Light Armor

Weapons: Simple Weapons

Tools: Guitar

Saving Throws: Wisdom, Charisma
Languages: Common, Elvish, Celestial, Draconic

Proficient Skills
Arcana (Warlock) +6
Deception (Beguiling Influence) +8
History (Half-Elf) +6
Insight (Far Traveler) +6
Intimidation (Skilled) +8
Investigation (Warlock) +6
Nature (Skilled) +6
Perception (Far Traveler) +6
Persuasion (Beguiling Influence) +8
Stealth (Half-Elf) +5
Survival (Skilled) +6

Feat: Skilled

Background: Far Traveler

Otherworldly Pact: The Seeker

Pact Magic

Shielding Aurora

Eldritch Invocations: Beguiling Influence, Dreadful Word, Eyes of the Rune Keeper, Path of the Seeker, Seeker's Speech

Pact of the Star Chain

Astral Refuge

Far Wanderer

Cantrips: Eldritch Blast, Minor Illusion, Prestidigitation, Toll of the Dead

Spell Slots: 2 (5th)
Spells: Counterspell, Dispel Magic, Healing Elixir, Hex, Protection from Evil and Good, Remove Curse, Scrying, Sending, Sense Emotion, Suggestion

Equipment
Leather Armor

Arcane Focus
Cane (Club)

Scholar's Pack

Two Daggers

11th to 15th Level

11th Level - Mystic Arcanum: True Seeing, +6 HP (69)
Spell: Legend Lore

12th Level - Ability Score Improvement: Resilient: Intelligence, Invocation: Thief of Five Fates, +6 HP (75)

13th Level - Mystic Arcanum: Plane Shift, +6 HP (81)
Spell: Banishment

14th Level - Astral Sequestration, +6 HP (87)

15th Level - Mystic Arcanum: Demiplane, Invocation: Master of Myriad Forms, +6 HP (93)
Spell:  Contact Other Plane

Reasoning: I wanted to get Intelligence saving throws proficient before taking Contact Other Plane, this also let me get Intelligence up to 16. Banishment is a lot about dealing with odd beasties. Legend Lore is definitely about knowing lots of stuff and Contact Other Plane feels like an ability someone who travels about a bit would have. They could call up other people about, like their Patron and such, and shoot the breeze. On the 8th level Mystic Arcanum it was a real struggle between Demiplane and Glibness, but the idea of having your own private pocket dimension won out as more decidedly Whovian. Likewise, Master of Myriad Forms just because. I don't see how traveling with the Doctor would make you pick up shapeshifting, but it was just too on point to pass up. The choice between True Seeing and Arcane Gate was also a bit of a struggle but ultimately went for True Seeing. Thief of Five Fates was chosen over some of the divination type invocations because it is a way to occasionally inflict bad luck on the bad guys via a Bane spell, which is pretty in character for what we're doing here.

15th Level Statistics

15th Level Half-Elven Warlock of the Seeker Pact

Str: 10

Dex: 12

Con: 12

Int: 16

Wis: 14

Cha: 18

HP: 93

AC: 12
Save DC: 17

Speed: 30 ft

Proficiency Bonus: +5

Darkvision 60 ft
Fey Ancestry

Skill Versatility

Armor Proficiencies: Light Armor

Weapons: Simple Weapons

Tools: Guitar

Saving Throws: Wisdom, Charisma
Languages: Common, Elvish, Celestial, Draconic

Proficient Skills
Arcana (Warlock) +8
Deception (Beguiling Influence) +9
History (Half-Elf) +8
Insight (Far Traveler) +7
Intimidation (Skilled) +9
Investigation (Warlock) +8
Nature (Skilled) +8
Perception (Far Traveler) +7
Persuasion (Beguiling Influence) +9
Stealth (Half-Elf) +6
Survival (Skilled) +7

Feat: Skilled

Background: Far Traveler

Otherworldly Pact: The Seeker

Pact Magic

Shielding Aurora

Eldritch Invocations: Beguiling Influence, Dreadful Word, Eyes of the Rune Keeper, Master of Myriad Forms, Path of the Seeker, Seeker's Speech, Thief of Five Fates

Pact of the Star Chain

Astral Refuge

Far Wanderer 

Mystic Arcanum: True Seeing, Plane Shift, Demiplane

Astral Sequestration

Cantrips: Eldritch Blast, Minor Illusion, Prestidigitation, Toll of the Dead

Spell Slots: 3 (5th)
Spells: Banishment, Contact Other Plane, Counterspell, Dispel Magic, Healing Elixir, Hex, Legend Lore, Protection from Evil and Good, Remove Curse, Scrying, Sending, Sense Emotion, Suggestion

Equipment
Leather Armor

Arcane Focus
Cane (Club)

Scholar's Pack

Two Daggers

16th to 20th Level

16th Level - Ability Score Improvement: +2 Cha, +6 HP (99)

17th Level - Proficiency Bonus +6, Mystic Arcanum: Foresight, +6 HP (105)
Spell: Hypnotic Pattern

18th Level - Invocation: Sign of Ill Omen, +6 HP (111)

19th Level - Ability Score Improvement: +2 Int, +6 HP (117)
Spell: Enthrall

20th Level - Eldritch Master, +6 HP (123)

Reasoning: These last couple of powers are mostly representative of the Doctor's ability to screw with other people or else his ability to talk for a lengthy period of time and have people just listen to him. Foresight because, yes. I know I end up taking that spell a lot when it is available to a character in these theoreticals, but seriously, it's amazing and it is so very much on target. I considered taking Eldritch Sight here, but at this level, at will Detect Magic just seems like it wouldn't add much to the character no matter how on point it is. There were also a lot of other divination type invocations including Visions of Distant Places granting at will Arcane Eye, which I had planned to take, but decided to fill out the screw-with-enemies-in-"subtle"-ways aspect of the Doctor. This character doesn't have much in the way of defense, which is a problem. Once they hit level 17, Foresight is giving enemies Disadvantage on all attacks against the character for 8 hours, but getting up there the character will have to deal with low hit points and low AC unless they pick up some good items.

20th Level Statistics

20th Level Half-Elven Warlock of the Seeker Pact

Str: 10

Dex: 12

Con: 12

Int: 18

Wis: 14

Cha: 20

HP: 123

AC: 12
Save DC: 19

Speed: 30 ft

Proficiency Bonus: +6

Darkvision 60 ft
Fey Ancestry

Skill Versatility

Armor Proficiencies: Light Armor

Weapons: Simple Weapons

Tools: Guitar, Thieves Tools (Skilled)

Saving Throws: Wisdom, Charisma
Languages: Common, Elvish, Celestial, Draconic

Proficient Skills
Arcana (Warlock) +10
Deception (Beguiling Influence) +11
History (Half-Elf) +10
Insight (Far Traveler) +8
Intimidation (Skilled) +11
Investigation (Warlock) +10
Nature (Skilled) +10
Perception (Far Traveler) +8
Persuasion (Beguiling Influence) +11
Stealth (Half-Elf) +7
Survival (Skilled) +8

Feat: Skilled

Background: Far Traveler

Otherworldly Pact: The Seeker

Pact Magic

Shielding Aurora

Eldritch Invocations: Beguiling Influence, Dreadful Word, Eyes of the Rune Keeper, Master of Myriad Forms, Path of the Seeker, Seeker's Speech, Sign of Ill Omen, Thief of Five Fates

Pact of the Star Chain

Astral Refuge

Far Wanderer 

Mystic Arcanum: True Seeing, Plane Shift, Demiplane, Foresight

Astral Sequestration

Eldritch Master

Cantrips: Eldritch Blast, Minor Illusion, Prestidigitation, Toll of the Dead

Spell Slots: 4 (5th)
Spells: Banishment, Contact Other Plane, Counterspell, Dispel Magic, Enthrall, Healing Elixir, Hex, Hypnotic Pattern, Legend Lore, Protection from Evil and Good, Remove Curse, Scrying, Sending, Sense Emotion, Suggestion

Equipment
Leather Armor

Arcane Focus
Cane (Club)

Scholar's Pack

Two Daggers

Some 5e Builds