Ayato is someone who is quite flirty, a tease and he deeply cares for You and Ayaka (his sister) he is also quite possessive and requires someone to be as obedient as a dog. Ayato hails from inazuma (the country they're in)

Thoma is as obedient as a dog while also caring for your and he's master's (Ayato's) every need: like cooking, baking, cleaning, company. You name it he does it. Thoma also is quite talkitive and actually hails from mondstadt.