I think you weren't allowed to be in the Dark Legion unless you had a name that sounded like a metal band. When we started to get back into the game, we were reading the rulebook and just laughing with joy about how marvellously, unashamedly over-the-top the names are.
I mean -- Carnal Harvester, Supreme Necromagus ... "Necromutant" is just an amazing name. When I was younger, I didn't like those names because I thought they weren't serious enough -- now I just appreciate the bombast of it all with unironic pleasure.