Kulilin is Goku's best friend, and has been around since the first
series. He is a fighting monk who leaves his temple to find and train
with Mutenroshi. He is kind of short, has no nose and throughout most of
the series, has no hair either. Kulilin trained with Goku under
Mutenroshi and afterwards shared many adventures with him. Kulilin has
died more times than anyone else in the series. He is one of the weaker
fighters, but this is partially due to his low self-confidence.
Nevertheless, he has gotten fairly powerful due to all his fights with
the really powerful enemies, and I think is the next strongest Z fighter
after Piccolo.