Button-Eyed Raven

Mimicry. The raven can mimic simple sounds it has heard, such as a whisper or chitter. A hearer can discern the sounds are imitations with a successful DC 10 Wisdom check.

Memory. The more the raven sees or experiences something the more time they begin to recognize patterns and learn commands.

Finders Keepers. Ravens are good at locating objects. The shiner the better. Player must make a (Perception) check to see if they can locate a random object. (It's up to the DM how many times this can be used)

Invisibility. The raven magically turns invisible until it attacks or until its concentration ends (as if concentrating on a spell). Any equipment the raven wears or carries is invisible with it.

Beak. Melee Attack: +4 to hit, reach 5 ft. (1d4) Piercing damage.

Scratch. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. (1d6) slashing damage

Vicious Mockery. The Raven unleashes a string of insults laced with subtle enchantments at one creature you can see or hear within range. The target must succeed on a Wisdom saving throw, DC 13 or take 1d6 Psychic damage and have Disadvantage on the next attack roll it makes before the end of its next turn. (Twice per long rest).

Shield of Shadows.  Upon an attack, a barrier of shadowy magical force appears heavily obscuring the body of the raven, protecting it. Until the start of your next turn, no attacks will damage the raven, and it will immediately turn invisible.