Archmage, I like the sheets mostly and I said before that there were transdimensional beings like this. But In-Universe it'd be kinda freaky having two extradimensional abominations running around like that. Likely some mystical force would have tried to kill them. And like I said before Supernatural creatures need some sort of connection to humanity otherwise why would they fight for them and why would the League trust them? 

Maybe you could have it that two humans were mutated this way or that these creatures formed a symbiotic relationship with humans like Abaddon's character. The main point is that their presence, the fact that they are wholly crossed over from outside our reality has greater implications that would be a bit much this early in the story. If you read the Codex, summoning a horror like that is a violation of the Fellowship's laws and the Magus would trip over themselves to try and slay the two of them. Plus reaching across the very boundary of our reality and plucking something out is a major working that requires massive skill, power, experience, preparation, and luck. No group of amateurs should be able to do it. 

There's also a few issues with powers but those aren't as important. The main thing is that Light's powers lack specificity and explanation for the how hell they work and how strong can she be? Atrophy is also a little wonky. That implies that she's taking energy and matter from the universe. Energy and matter that can't be created or destroyed. She's literally subtracting from the Universe and that's a little much, also there's really no explanation for how that even happens. Also if she can regenerate from having no head what can kill her? 

As for MC the only issues are that Omni-Magic is overpowered. Every Sorcerer's spell is different. There is no universal standard for how to make a fireball. Being able to figure out how any wizard does anything with a look is too much. And the other thing is that Chaos Magic pierces everything which i said in the guidelines you can't have for your powers. A sufficiently strong ward should be able to block it. Also there's already an Archmage and he'd be pretty pissed if some beastie went around using the name :P 

Anyway those are my issues with the sheet and I want to hear your thoughts on it. 

Biddz, Emanuel was already a character so he's in. But on second reading I think perhaps you should reduce the numbers of tendrils he has to like two. Otherwise he's an unstoppable electric octopus :P 

And Maxwell is way too powerful. 5000 degrees is really, frickin hot. That much heat would kill someone just by standing a sufficient anywhere near him. That power needs to be cut down drastically, like to the hundreds or something. Turn Evil should protect him from demonic forces to a degree not just wipe them out just like that. Unbreakable wielder should have some kind of short time limit if that's to be balanced and his armor and shield have to be cut down considerably too. He already has super-durability with armor and shield as durable as him he's basically unstoppable. The shield can keep it's magical diffusion abilities but it's size has to be reduced. Shields are not the size of the whole warrior. Also his armor being 1500 pounds of steel is a bit much too especially since it covers everything. Armor that covers everything allows for basically zero mobility. 

The Average Main Battle tank is 60-70 tons. That should be the upper limit of his strength even if he's supercharging. Also 300 miles is way too fast, especially if he's already that strong and tough. He could be a good long-distance runner but he shouldn't be any faster than most people to preserve balance. He could probably jump pretty long though. Also being really frickin' big and heavy makes it seem very odd for him to have great reflexes too. Maxwell seems like a Glacier. Giving a Glacier lightning speed is too much. His density should mean that attacks such as rockets or grenades should hurt him somewhat.

In fact if he has the Golden Flame why not make it so that he is regularly only as strong as a ten-foot Goliath would be and using the Flame he can get stronger? Using more flame results in higher tier powers but comes with a tax on his stamina. How about that?