Atton could easily become a villain without any kind of shift in his moral compass, goals, personality or anything - after all, he's already been a Sith once. So it wouldn't really take any kind of leap at all for him to decide 'eh, screw this' and become a Sith Lord.
(Given how wholly untrustworthy he is, I imagine everyone's reaction would be one of a dull lack of surprise.)
In which case he'd be - more or less exactly the same, just on the other side. Which would be terrifying.
I cannot imagine Teddy turning evil. His moral compass is absurdly rigid, I think nothing short of being driven insane could make him even slightly sway from being utterly Lawful Good.
Leonardo wouldn't really turn evil, because he doesn't have an unpleasant bone in his body. A villainous Leonardo would be a Leonardo who didn't care about the effects of his inventions (or else just being manipulated, because manipulating Leo is pretty goddamn easy), probably working for evil!Mac and evil!Lorenzo.
Leo - well, his twin brother is a villain, and a pretty diabolical one (with some gigantic women issues)? Leo's own moral compass is a little shaky at best. I imagine if Leo went evil, he'd be a lot like a more pragmatic, less issues-with-women-ful, less hitting-on-my-twin-brother-and-engaging-in-dubiously-sexual-acts-of-violence-against-him Sigma. He wouldn't be as vindictive, either, but he'd make up for it with pure, directed at the entire world, unrelenting fury. He'd have more or less the same goal, too: Wipe out the Horrors, and make Makai Knights redundant.
Seamus would be terrible at being evil. Just not very good at it at all.
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(Given how wholly untrustworthy he is, I imagine everyone's reaction would be one of a dull lack of surprise.)
In which case he'd be - more or less exactly the same, just on the other side. Which would be terrifying.
I cannot imagine Teddy turning evil. His moral compass is absurdly rigid, I think nothing short of being driven insane could make him even slightly sway from being utterly Lawful Good.
Leonardo wouldn't really turn evil, because he doesn't have an unpleasant bone in his body. A villainous Leonardo would be a Leonardo who didn't care about the effects of his inventions (or else just being manipulated, because manipulating Leo is pretty goddamn easy), probably working for evil!Mac and evil!Lorenzo.
Leo - well, his twin brother is a villain, and a pretty diabolical one (with some gigantic women issues)? Leo's own moral compass is a little shaky at best. I imagine if Leo went evil, he'd be a lot like a more pragmatic, less issues-with-women-ful, less hitting-on-my-twin-brother-and-engaging-in-dubiously-sexual-acts-of-violence-against-him Sigma. He wouldn't be as vindictive, either, but he'd make up for it with pure, directed at the entire world, unrelenting fury. He'd have more or less the same goal, too: Wipe out the Horrors, and make Makai Knights redundant.
Seamus would be terrible at being evil. Just not very good at it at all.