Aigaron is just a Knight of the army and in the same rank as Dogold and Candelilla, thus ranking higher than Luckyuro.
Wrench shares the same rank as Curio and Poisandra but ranks lower than Fury.
Aigaron harbored romantic feelings for Candelilla.
Wrench is close friends and comrades with Poisandra but not mates and not explicitly in love with her.
Aigaron did not create Luckyuro.
Wrench created Curio from old monster parts under Sledge's orders to act as Poisandra's early wedding present and a convenient distraction for her constant whining.
Aigaron cries a lot.
Wrench only cries and whines when he gets hurt very badly.
Aigaron's body is fully armored, so much that even his spirit cannot escape from it.