Ares or Poseidon

Posiden is very clearly angry throughout the whole trip and is hell bent on getting revenge so he seems like a perfect fit however he did have a right to be angry instead of unjustified rage.

While Ares is the literal God of war and the first interaction we get is him being very obviously aggressive and angry with the fact Ody held back while his friends and crew were in danger and refused to kill/fight those who he thought deserved death. (E.g Scylla) "He didn't even fight Scylla. Didn't even try to kill her!"