Familiars/Animal Sidekicks

YAOI!! Do not read if you don't like!
Bunny like animals.

A middle aged man is reincarnated into the body of a baby and gains the ability of a tamer. I'm not sure about this one. I find the sister and other girls at the orphanage the definition of irritating.

Holy beasts! Roux is so adorable!!
Girl was reincarnated into the world of a fantasy novel she'd read in her previous life, and of course she's the villainess! She wants to avoid the bad end and decides to become an adventurer.
She's got an adorable little tiger spirit with her, and there's also a phoenix that's appeared so far. hoping more appear.

I LOVE IT! A different type of isekai where instead of a harem the MC takes in two orphaned kids! (twins) all three are OP, but that's fine because they are so cute!
Also, FAMILIARS! There's a wolf, a tiger, and a hawk! So much cuteness!

Boy accidentally ends up contracted with a demon cat, and must now fight other demons!

Reincarnated boy helps two Fenris and gets their pup after they die during the fight.

So most people should at least have heard of Toriko in one way or another I feel, but if not the idea is it's the gourmet age and there are such things as gourmet hunters, this story follows one such hunter and his chef partner as they search for the ultimate in taste!
It's on this list for the animal partners! Quin, Kiss, Terry, and Uyn are all adorably awesome!

There's a bird that's also a gun/cannon. Only reason it makes the list.

Actual familiars! Like, contracts and summoning familiars! YES! Also cute and hilarious. The MC's familiar is also adorable, and the circumstances around the familiar is an awesome joke.

This is a spin-off of a previous manga on this list in which we get to see the day to day lives of the party from the slime familiar's POV.