Tenshinhan

He is neither here or there for me.

Tenshinhan ends up becoming redundant with Krillin, who has been around longer, is stronger than him by a good margin once the likes of Cell show up, and already fills the role of "weak but skilled who manages to make an annoyance of himself for the villain" better than Tenshinhan could ever hope to do.

Still, he has a very cool design, some interesting techniques (growing additional arms or splitting into 4 identical bodies, not to mention the tri-beam) and left the story with one last glorious stand-off against Cell, delaying him more than anyone had managed at this point aside from 16.

A great character who managed to leave with one last glorious moment before becoming irrelevant.

I think the thing that makes me love Tien so much is the fact that he's always so outmatched in Dragon Ball Z yet he still tri beams the hell out of enemys way stronger than him.  He's no contest the strongest human on the show.