At first, I was going to keep his original looks, and then i started thinking, "What if Mondatta changes his looks so no one knows hes the leader of null sector" so I gave him a new look,a another idea of him trying to make his head to resemble a ant cause he remembers ramattra and zenyatta liking ants.
But also thought of him as a spider ant you know those spiders that mimic to be a ant to enter and eat larvea or jump at an unsuspecting ant. He hates them yet becomes the very thing he hates, but it's effective.
He can revert back to his original form with a tech that was given to him by a loyal ally.
He currently learning how to fight and these are the abilities i thought when hes in his null sector form.
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His right arm, the one above the other arm, is his main weapon it's like a plasma pistol from halo, but if hold for too long it will automatically shoot and take hp, making him wince in pain, but also one shot a characters but not tanks or other characters with a higher hp. Can kill him too if doing it this alot.
His first ability i thought would be him able to give himself a buff and speed boost, you'll see four floating spheres glowing around him when this happens.
His other arm controls five floating spheres, this ability makes a shield, this one is like reed Richard in marvel rival but instead of just absorbing and shooting back the enemy.
it gives you a choice, to heal or kill. It automatically goes to the person your healing but for shooting, you gotta aim well. The shield can break it reaches at 0%
Third ability can debuff an enemy it wont slow them down but it will lower their damage or healing(if he manages to hit a support). Its like sombra when she hits you with the virus. But instead of damage overtime, he debuffs you.
I think his ultimate would be similar to ramattra and zenyatta but instead of healing or constant damage it Buff allies and debuffs all enemies.
Mondatta is a dps like support meant to help his allies.
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He also changes his voice to make sure he doesn't expose himself cause there are many who will try to find ways to get rid of him. Pretending to bring peace while secretly planning to raid and capture omnics much as possible for his next plan.