This is certainly Wodan Ymir. Sanger doesn't pilot the Thrud. I kept the Sanger tag cause Wodan is just another Sanger.

Actually, in Super Robot Wars Alpha Gaiden (PS1), the game Thrudgelmir originally appeared in, Sanger -was- Thrudgelmir's pilot. This is the reason why Wodan is an alternate-universe copy of Sanger: so they could keep his storyline close to Sanger's SWRAG storyline.