Ajantis. In a game of one-dimensional party members he is the most one-dimensional, stereotypical paladin ever-he has no personality and he picks fights with any evil party members. It sucks because he has decent stats and can be acquired relatively early on.
Khalid is just the fucking worst, though. He's the "lovable" coward character (i.e. annoying bitch), but his stats make it seem like he's supposed to be a half-decent tank, which is negated by the fact that he runs away unless you have a bard on his ass. It can be argued that he's better for archery, but he has 15 dex and there's a million better archers. He's borderline useless, but the shittiest part is that he's in a pair with Jaheira, a decent party member who carries over into BG2, so if you want her you have to have him in your party; not only that, he's one of the only good-aligned party members who can tank shit real early on, and the game actually encourages you to have him and jaheira. Meeting up with them is the first quest. Hell, he's canonically one of your party members. Fuck khalid, man.