Producer Andrew Kreisberg mentioned Doctor Alchemy a while ago as one of the villains we can expect to see turning up in season 2, and given that the show is exploring alternate timelines and dimensions, he's certainly a character who would fit. Dr Al, as no one calls him, is a bit of a split personality. A former police forensics officer, he could be considered just another normal, upstanding citizen of it weren't for the fact that he's also a criminal who possesses the Philosopher's Stone (so much for Nicholas Flamel destroying it...) and uses it to transmute any element he wishes. He's not likely to be a major villain, but he should be fun for a couple of episodes this year.