Hmm...not sure at the moment.
I don't dislike anyone. But I guess I'll say Wesley since he bounced halfway through the show and it disappointed me the first time I watched it. Not sure why everyone hates on Wesley, but I was kind of mad when he left.
Love them all...but I suppose...Jake was the most useless.
If I HAVE to choose, I suppose Kes.
I'll say Malcolm Reed. Not enough development and I didn't find myself caring much about him.
Chekov was a little bit annoying in STID.