Bowser is A overlord king thats a hero. He stops his Evil 2nd older twin brother Onaga Koopa. his wife is Clawdia Koopa was also known as Queen Koopa(or queen bowser for some odd reason) his wife never appeared any mario series(expect for The show super mario bros. anime version) he is really crappy about that. He makes friends with amy on episode 16 Brawl at Mall.
Here Appearaned in Super Mario Bros.3(1990) he almost appeared in Every Mario game.