At level 1, you only have access to Protect!, Eternal Companion, and Growing. Every two levels, gain access to one of your other abilities (chosen by the party).
You can move through physical objects and walls, treating them as difficult terrain. You cannot end your turn in a solid wall.
Your movement increases by 2.
Your maximum HP increases to 10 per level.
Your attacks deal an extra 3 damage.
You can Interpose at a range of 4.
You can use your reaction to reduce damage you take from an attack by 20.
- •Protect!1d4.
On crit: Frightened. During this round, you can use your reaction to interpose.
- •You Won't Get Past Me!1d8+2.
On hit: Grappled (escape DC 12). During this round, you can use your reaction to reduce damage you take from an attack by 10.
- •Sic 'Em!2d4+4..
Deals an additional 1d4 for each Hero within Reach: 3.
- •Emotional Support.
Heal a non-wound status condition from all allies.
- •First-Aid Delivery!
Feed someone a healing potion you are carrying. It heals an extra 2d4+2.
- •Fetch!
Move 4, grab an object, then Move 4 again.
Eternal Companion - You are an eternal companion to your person and cannot truly die. If you are reduced to 0 HP, you vanish, but will always return. You'll never be gone for longer than a Safe Rest, and will often come back sooner.
I wrote this companion as a dog, but it can be any animal. Or person, I guess, but it is pretty animal coded and that might not have great implications without rewriting. It's also "The Goodest Boy" but there is no reason you can't have it be "The Goodest Girl" or even just "The Goodest Insert Pet Species".
Dedicated to my dog, KC.