Beserker: The frenzied warriors of Norse history.
Freya: Goddess of war, fertility and beauty. Explains personality and her looks (who I think is a reference to Casca from Berserk).
Loki: The god of mischief, Loki. Was brewing plans to bring the end of Ragnarök (how ironic).
Siegfried is based off the Norse legend Sigurd/Siegfried. One who bathe in the dragon's blood for invulnerability except for one spot where the leaf landed. Which is why he makes note of that wind he came to the aid of the Shinpaku Alliance from his training in Tibet: "I have no leaf!"
Hermit: As mentioned above. Worth pointing out that he was actually the second strongest member of the Eight Fist (as Sho Kano suggested no one who wasn't in Yomi should be able to beat him and also when Tanimoto was only worried about Odin when Kenichi asked him).
Thor: Based on... I don't know? His size? Heavy strikes? He has a technique that's related to Mjolnir, but that's it.
Valkyrie: Female figures responsible for choosing who lives and who dies in battle. Some get to go up to Freya.
Then you have Asuka Atasuki(?), Lugh, the submission man. His name is based the Irish hero of legend.
Rimi Kokonoe, Alantae is of Greek mythology. A virgin who refused to marry but is loved by some hero. Total opposite of her personality, minus the virgin part.
That's what stands out to me, but I could go for more.
There's also Tirawit Kōkin, Narasimha of Hindu legend. He who finds the smallest cracks to break through (or something like that). I believe even his name, Kōkin (which seems to refer to caulking, the sealing of gaps), references to that. Not entirely sure.
Edited by Delirium Trigger, September 28 2018 - 09:12 PM.