It would be cool if you could tame other creatures, heres a few ideas:
bees
you can ride them and fly around the map. a saddle could be like an endgame thing though so its not easy to have them as a mount at the start. they could go like 15-25 cm a second depending on its happiness and a saddle could be made of 6 berry leather, 8 dust mite fuzz, 2 plant fiber and 6 lint rope. to tame the bee it would need a few nectar and only able to tame the bees at night when theyre asleep so they dont target you. you could put a few next to the bee and itll tame after it wakes up.
mites
they could be a small fighting pet. you could feed it the mite fuzz potions and then they can fight beside you
larva
you can ride them along with have them as a tier 2 fighter pet. youll need cooked aphid meat. you can make a saddle with 3 berry leather, 5 gnat fuzz, and 2 crude rope. they do alot more damage than the mites and they can go alittle slower than what you can run but they dont have a running capability so it wont waste stamina going across long distances.
ladybird larva
like the larva, but tier 3 fighter and also ridable. uses same saddle but you need miteloaf to tame them. theyre faster than the larva and do much more damage with an added debuff of sizzle for a few seconds.