Good choice on Data for favorite TNG character. Now, which main character is your LEAST favorite? (If Wesley, post two. Wesley is too easy a choice)
You know what? I DON'T hate Wesley Crusher, and I kind of like his season 1 rainbow sweater. So you all can suck it.
So now that I've alienated both Star Trek fans (who hate him) and non-Star Trek fans (who are confused), I'll address the actual question.
First, I totally hate all Ferengi. They're like really offensive caricatures of Jews . . . in SPACE! And I hate them. They are demented. Their values are insane.
However, I'm assuming this question refers to someone in the main cast, so I'm going to have to go with Riker. Now, it's not like he actively BOTHERS me, but he doesn't really do anything for me.

