Where did bowser come from?

[Bowser the great]

well i don't now where he came myself but i wonder was he adopted did he come from the same people like mario and lugi or was he fonded? who nows i just now that peach came from a egg

[Winx]

Well.. it depends on what storyline you go by, the movie,the games, or popular theory.
(game-wise)
I'm under the impression that Bowser hatched from an egg layed by his mother, who somehow passed away with her husband, the previous king,a long time ago. This would explain why Kamek was taking care of him in his earlier days, and how a baby could gain the title of King (he inherited it)...at least I think so, anyways...and I think it was Daisy who hatched from the egg in the movie...