Scarlet Witch, Storm, Thor, Loki, Ghost Rider, Human Torch, Iron Man, Rocket Raccoon and Jean all have the potential to be AoE/ranged if built that way.
I'm really liking Iron Man's Aoe too. Most of his good abilities are aoe.
Pulse Bolt - shooting a pulsing aoe ball that you can pretty much spam, it travels quite a bit of distance, and it also stuns.
Micro Missiles - not aoe but a lot of homing missiles shoot around finding targets.
Jericho Missiles - like the Jericho missiles after the pulsing ball (which also stuns and holds enemies in place usually),
The One Off - insane damage and is on a 12 second or so cooldown, and the area is massive.
Coolant Blast - Cone Aoe, it's strong, maybe his strongest ability but I don't like it. The graphics for it makes it seem shorter range than it is so it's hard for me to judge where it's range is. It's probably the same range and properties as Ms. Marvel's Photonic Wave.
He has a great spirit regenerating ability that sacrifice a bit of his shields to restore 20% - 30% spirit (depending on how many points you have in it. It keeps you using abilities since you can then reup the shield with some of the spirit restored after a few uses. After getting Scarlet Witch, then Rocket Raccoon to 60, Iron Man being my third that's getting to 60 is fun with his AOE. Pretty much everything he does is aoe, I don't even really have to use his spirit free beams to regain spirit (one adds vulnerability though so I sneak that in between stufff).