First off, Sera is absolutely adorable! I love the breed the little munchkin is! Is it ragdoll, birman? Either way, I just think colour point cats are way too cute! The use of the brown pupils but the blue iris works really well for me. It's a subtle type of eye catching that I think is rather neat. The little star on Sera's chest? *chefs kiss* Just too cute, but then again I'm also someone who loves star markings on animals haha. I also think the outfits he has look comfortable and cozy. I also wanted to say the plot of the universe Sera is in also works well for his design. When you're in a world where five people set off to do the job of a chosen hero, using designs like this really give the feeling of "they're just regular people / just your average joe" which is nice.

art and design by ABMy
I just got him today, but Oxalis?
My idea for him is that he's a traveling vagabond who brings the power of spring and winter with them at all times. To describe their magic, it's like that exact moment between winter and spring, where the snow starts to melt and new plants can start to grow. In their pocket I imagine they carry with them a magical deck of cards. Oxalis is unsure of what they want to do with themselves so they're constantly traveling. He doesn't want to think about who he is or what he is because it scares him.