Responses
YES! XDDD
I already mentioned the same thing in both mangas a while ago, wondering if they shared author or artist. It's not only the rabbit, there are several other coincidences.
Authors might be friends. Stuff like hidden characters like these appear when authors are friends and help eachother with their respective works sometimes.
the rabbit looks so much like vivi from The symbiotic relationship between a black panther and a rabbit