Yeah, thatis one small thing. If we go with the color based names (Which seems kinda important to RWBY, every character/team name is meant to evoke a color of course), 3 word teams kinda limits that! but, it's up to te DM. I mean, I don't really mind a 3 person team. Stretching canon a lil bit but it can be dolled up as experimental, smaller teams or something. Though, it's hardly something to put a campaign on hold, or anything!
My character and Atikinson's/Florence's (if they go with the siblings idea) might also have some common ground if they come from disadvantaged/troubles lives. He certainly wouldn't say he's had it as hard as a faunus, but, having grown up in more dire straits, he could certainly understand some of where she comes from, but he's also working to rise above that himself, and to better the lives of others by hunting down Grimm.