Stella is the one willing to try out multiple different things- different jobs, different building, different anything. Songs to sing to, papers to fold, she's willing to be a jack of all trades, master of none.
Suppose that's why she joined the adventuring party. Otherwise, she was just... normal. Never belonging, of course, since she was a not-cat, but she felt... normal. And normal she will be for these guys. (Maybe she'll finally be different here, once she's done enough in this new land.)
---
she's friends with icora! when ae approached with an offer to try and investigate, stella leaped at the chance- and the two of them have many fun discussions together.