Lets talk about Doom.

[Echorion]

What do you think his kit would or potentially be if/when added to the game?
My personal theory kit:

Dr. Doom, Vanguard

LMB [PHOTON SHOT]
Doom fires several damaging energy projectiles from his fingertips in a widening spread.

RMB [PLASMA BURST]
Doom unleashes all the supercharged matter in their molecular shield at a target, dissipating the shield but doing high damage in a small area.

E [MOLECULAR SHIELD]
Doom generates a shield of plasma charged matter that swirls around them, absorbing damage as well as damaging any enemies it comes into contact with
-Activating this again will cause the shield's range to expand in a larger ring around Doom ,however it will no longer absorb incoming damage.

SHIFT [FLIGHT]
Doom propels them-self into flight with jet boosters for a brief period of time.

F (When in air) [FOOTDIVE]
Doom dives downward with enough force to deal damage in an area, or briefly stun a hero if they hit them directly.

Passive: "There is only Doom"
Dr. Doom receives additional bonus health when they are currently ACE or have the most Eliminations of anyone on the team.

I don't have an idea as to what they might have for an ultimate yet.... but it's fun to think about these things!

[Kyutaru]

Footdive... ah to be young again and play Marvel vs Capcom.

I think you have a lot of technology but it's also archaic and Doom is known more for being a master sorcerer that fuses science with magic. The current MCU version will be Tony Stark and he's just the type to have the science down, but with the brain gifted enough to teach himself magic too, especially from something like the Darkhold. So magic has got to be in his kit somewhere. He's Dr Doom, Master Sorcerer.