Lucas, Claus, Rosella, Nana, Kumatora, and the rest of the Tazmily kids all put on some banger LARPs. Even when they get older they still LARP on the occasion.
Lucas has a bit of a feminine side and is not ashamed of it. He got more in touch with that feminine side when Nana started LARPing with the friend group. The two of them always crossdress for funsies.
Edit: Lucas is not necessarily a femboy in my Clausella stuff per se, but he's comfortable enough in his masculinity to pretend to be like—a princess every once in a while.