Boudicca the Wolfdog Sidekick

Keen Hearing and Smell. The wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Indomitable: Boudicca can reroll a failing saving throw, but she must use the new roll. After using this feature, she must finish a long rest before she can use it again. 

Armor Proficiency: Boudicca is proficient with all armor.

Attacker: Boudicca gains a +2 bonus to all attack rolls.

Improved Critical: Boudicca's attack rolls score a critical hit on a roll of 19 or 20 on the d20.

Improved Defense. Boudicca's Armor Class increases by 1.

Battle Readiness: Boudicca has an advantage on initiative rolls.

Piercer [Feat]: Once per turn, when Boudicca hits a creature with an attack that deals piercing damage, she can reroll one of the attack's damage dice, and she must use the new roll.

Fey Touched [Feat]: 1st Level (1 Slot)Misty Step, Command; (Spellcasting Ability: Wisdom).

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 4 (1d6+ 3) piercing damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone.

Second Wind: Boudicca can use a bonus action on her turn to regain hit points equal to 1d10 + 12. Once she uses this feature, she must finish a short or long rest before she can use it again.