I’d probably also keep Joon, and hope to land his costume in the future. Malosi? I don’t know. His ability to disable status effects for 3 turns is nice, but it usually means he’s targeting an All-Enemy or Damage on Three-type of enemy since single target snipers don’t typically leave status ailments although Joon does blind his target. Malosi could be a good counter to Gravemaker, Frida, Evelyn, and others. Tough call. You don’t get as much damage to the target out of Malosi as you would Joon but disabling status ailments out of the target for three turns could be useful. Neither would pose any threat to emblems with Malosi being a Barbarian and Joon a Monk or Fighter if in Costume.
I don’t know. I think I’d go for the 468% damage to the target and -40% attack accuracy on the target for 6 turns that Joon offers over Malosi’s 370% damage to the target.
In costume Joon can get to 488% damage to a target and -35% attack accuracy to the target for four turns.
Actually, yes, I’d stay with Joon.