Sim can be good for questing or AQ. I'll probably have to rank up mine due to expiring cats since he's duped. Not a ton of great 5* cosmic. Basically just captain marvel and hyperion.
You didn't say if they're awakened; but if they are, Ronan in a heartbeat. He's a great champ; as he can deal with almost anyone's strong points - use the opponent's buffs to make his attack and stun stronger; turns Fury into Weakness; turns Armour Up into Armour Break.
Add in guaranteed Stuns, Poison immunity and some pretty good synergies; and Ronan is a very solid (if not God-Tier) champion.
Picking up a random 4-Star Cosmic Awakening Gem was my spur to finally take on Realm of Legends. My Awakened Ronan is now 5/50 and an integral part of my questing team. I haven't for a moment wished I'd held onto the Gem for someone else (not even the 4-star Hyperion I got more recently - he doesn't really need it to be powerful; whereas Ronan gained far more from it, and can't be awakened any other way).
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Add in guaranteed Stuns, Poison immunity and some pretty good synergies; and Ronan is a very solid (if not God-Tier) champion.
Picking up a random 4-Star Cosmic Awakening Gem was my spur to finally take on Realm of Legends. My Awakened Ronan is now 5/50 and an integral part of my questing team. I haven't for a moment wished I'd held onto the Gem for someone else (not even the 4-star Hyperion I got more recently - he doesn't really need it to be powerful; whereas Ronan gained far more from it, and can't be awakened any other way).