[MaxWilson]

Because thugs need to be gem-cheap, they're more likely to be recruitable units (which cost only gold) than summons. Still, avoiding national summons and sticking to generic only (and leaving off uniques):

Banes and Bane Lords come to mind. Vampires and Vampire Counts. Troll Kings and to a lesser extent Sea Kings. Llamia queens. Spectres. The mages you get from Unfrozen or Hidden in Snow don't usually make great thugs because they're #noheal, but with enough lifedrain that may not matter. Golems and poison golems. MAYBE Fairy Queens but I've never tried it (low HP will probably be fragile, but she's a thug not an SC right?). Firbolg Sleepers.

Wraith Lords may be thugs or light SCs. Tartarians are cheap enough to use as thugs if you have GoH up.

That's all I've got from memory. There's probably some blood and nature chassises that I've missed. Death obviously has the best summonable chassises of the ones I can remember, but Troll Kings aren't bad.

-Max