Hmm that's a good point. I tend not to hate many characters outright.
I guess the nearest equivalents would be the Star Gate from Mario & Luigi: Partners in Time, the Dream Stone Spirit from Mario & Luigi: Dream Team and Adaphne from Mario & Luigi: Brothership.
Considering characters that come from a franchise I actually like because it's obvious that I dislike characters from media that I dislike. I don't really like Rouge the Bat or Birdo. I don't know if I outright hate them but if it was up to me I defenitely would erase Birdo from existence. I don't really like most partners in Paper Mario TTYD, they all feel like knock-offs of the orignal Paper Mario on N64.
This motherfucker, right here. This greasy, smug, spoiled, selfish, arrogant, abusive, entitled, creepy, hypocritical bastard.
If you've seen the original Macross TV series in it's entirety, you know...
I actually had some degree of sympathy for him in his earliest appearances, but by the time I was nearing the end of the series, I wanted to reach through the screen and strangle him every time I had to look at his smug prick face.