Which other character do you dislike?
For me it's that copy guy... I'm sorry, but I just can't take him, lol. His cooking methods are just too unrealistic for me to accept. If we also disregard the horrible female "antagonists" (aka female estate agent and Karaage woman), I don't really dislike anyone. Akira is ok... Like Takumi and Isami much more, but Akira is really cute with Shun.
Same here, the Copy Guy is the person I disliked the most, his image training method is too OTT, though Akira's nose and Erina's tongue can also be considered similar OTT. I didn't like Akira because his methods are too narrow, and relies too heavily on his nose, and for me was the worst possible person to win the competition. The Copy Cat just crepped me out, the way he went about immitating the opponant was just *shudders* and a bit too out their as special abilities go, though it was put to good use in the last chapter but still didn't take away from how creepy it was, and his methods were underhanded, atleast he learnt from his errors and became a better person and probably cook as well, and is not as dislikable.
I'm not sure Akira did the same, he showed the same level of arrogance as the french cook to me when he was in a slump, yet it was somehow fine...I felt the only reason he won was because the Mangaka wanted to highlight the whole when a person has someone to cook for line...and his skills had nothing to do with it. even though his softer side is shown I still dislike him, probably more so than the copy cat right now.
I don't dislike any other person in the manga, even the crazy stalker girl with the disturbing cooking, and the arrogant number 9 and 8 seat I don't really dislike, though that could chancge once we find out more about them. I also don't include the real estate and Kaarage women, if I did then I'd have to include those random two that keep on talking down to Megumi.