I’m 100% in favor of Malosi. Being very fast, shuttung down an enemy’s move AND a critical elemental move is amazing. He’s a monster and none of the others would take Drake or Sif off your defense.
I agree with @Chadmo on Malosi. I would personally give strong consideration to Leonidas as well.
He is durable, especially factoring his self heal. His mana cut of 40% is not insignificant either. Depending on the enemy it can buy you multiple turns. While he isn’t sniper strong his damage isn’t nothing either. I am a big fan. If you get his costume his potential only goes up from there.