I voted skill because I like how a lot of them play, but I totally get why so many say mutants.
I was also tempted to say mystics, but the problem there is that most of the top champions there are good at basically the same thing: dealing with buffs and stealing power. I find it quite difficult to rank up champions that all feel very dissimilar from each other, which is a shame. My two most recent such champs have been Mojo and Tigra, and I'm really happy with them, but their quirkiness feels quite rare in the class.
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My most favorite is Colossus.
I was also tempted to say mystics, but the problem there is that most of the top champions there are good at basically the same thing: dealing with buffs and stealing power. I find it quite difficult to rank up champions that all feel very dissimilar from each other, which is a shame. My two most recent such champs have been Mojo and Tigra, and I'm really happy with them, but their quirkiness feels quite rare in the class.