could you maybe specify what you mean by "helping with the characters design"? because we already have someone who will make the renders of all the characters.
I mean come up with characters and how they look (I'm not very good at English, so I may write incomprehensibly)
oh, so you'll help make mockups for the characters, right? mockups are drawings of what you want the final design to look like, by the way.
also, I'd say your English is pretty good!