I use Captain America, Deadpool, Magneto, and Moon Knight
If you like this game X-men legends 1 and 2 are worth looks since they're basically predecessors but just x-men related.
Also they're making a sequel to Marvel UA, and it'll be based on the Civil War series with you choosing your sides with features like fusing of heroes powers to create special attacks(aka storm electrifying spidey's webs ect)