For some fans, part of the appeal of anime is thinking about which characters would be relationship material if they were real. Some anime characters seem like they'd make terrible significant others, though. It could be because they treat their canon boyfriends or girlfriends like garbage; their cartoon relationships are truly disturbing. It could be because they're really insecure and willing to inflict violence on anyone who so much as looks at their crush. It could be because they're just really exhausting to be around.
One person's dream date is another person's nightmare, so you likely won't agree with all the selections here. You might even give some a chance despite all the red flags, but hey, no judgment.