it depends, if you like lolicon/shotacon and are an animesexual and also into irl people it could be a sign you might have pedophilic disorder. "its also illegal to lewd the loli in the us and uk"
but if you only like anime characters and don't like any that you will be jailed for then no its not bad. even if it is a fetish it is no ones right to force you into a "normal" realationship if you don't want one