Haruk- okay no probably not Haruki, that's the funny meme (but also occasionally true) answer but probably not the best answer. Off the top of my head probably Shinji Matou, I don't doubt there are other characters that might fit the bill equally or maybe even more so but I guess my brain's doing a good job of filtering out other characters I might similarly despise and that's for the better! Actually, my brain also remembered Takumi Ichinose from Nana and he definitely also fits the bill......Shinji's an easy answer bc he's so overly and aggressively shitty and pathetic as a person but Takumi's more the kind I find vile and detestable in the way scummy but mundane people can be in more realistic contexts.

Public figure/celebritywise I don't think there are many (if any) I despise enough that I'd want to myself, though some are real close to crossing the line and more of the variety that if they face the consequences of their own actions in a painful way I'd lose no sleep over. A certain former US president comes to mind, but really this could apply to quite a few of the more aggressively bigoted and hateful people out there, especially those with the active power and clout to make things worse for those they discriminate against.