I don't think serious prevents marriage. We've had a lot of married characters in Arcaea and done some fine wedding RPs. None of them were "funny" in the sense of being Badgersquirreltutu funny (though there was often a lot of humour). Generally they've been part of large arcs and some have had major impacts on the game. (Jenred's obsession with his wife is fairly well-known, for example.)
