In the year of 736 Krillen is
born. He first comes to us in Dragonball. He is a child like
Goku and they train together at Master Roshi's. They become best
friends and have many battles together. At one point Krillen is
killed. Goku goes after revenge. Bulma creates something to
preserve Krillen's body while they gather the dragonballs to wish him back
to life.
Krillen is a strong presence all thru Dragonball Z. In the
beginning he is a member of the Earths Special Forces. He is the
strongest human. Krillen is very crucial to Kakarott's evolution
into Super Saiyan - seeing Krillen literally blown up by Freiza causes
Kakarott's anger to propel him into Super Saiyan status. Of course
Krillen does get wished back - again. Eventually the Saiyans
surpass him completely in strength - almost to the point where he doesn't
even fight that much because he cant hang. He was the only one with
faith in 18 - he couldn't make himself destroy her when he had the
chance.. she eventually becomes his wife. Krillen names his daughter
(with 18) kind of after his first girlfriend Maron - his daughter is
Marron.
There really is a whole lot more to this little monk but I run a site
for Saiyans, not little bald guys with no noses.