Gigan, known as the "Monster of Steel," was once a major problem for King Desha's forces—he betrayed the army and got locked up in the Underworld for it. That all changed when Miranjo broke him out.
After that, Gigan ended up pledging himself to Bojji. Things got messy pretty quickly though. King Desha forcibly brought him into the Order of the Underworld, which basically wiped his slate clean as far as his old crimes went.
Content compiled by AnimeList.moe from publicly available sources.
