...but no, seriously, you should have expected this. Castor is here, though in this life he goes by Brandon Murphy-Coleman. He's the 20 year old brother of Pollux, aka Rory Murphy-Coleman, and he's a junior in the Atrophysics program.
His powers: Flash of the blade: Although he's never formally taken lessons, Castor is an excellent fencer. When he picks up his weapon it's like it becomes a part of him, regardless of what sword-type he chooses. He's not impossible to beat, but fighting him is incredibly challenging.
Horse sense: Castor has a knack with horses, to the point where some suspect he can speak to and understand them. Their suspicions would be correct, though it's not something he broadcasts.
This mortal coil: Due to his less-than-divine parentage, Castor knows that he's fated to die at some point. However, he's unsure of exactly when and how. What he does know, is that if he's about to do something that could end in his potential death, he gets a tingling in his spine that warns him to be cautious.
He'll be in Fencing, Animal Rights, and Parkour, and he works at The Ark. Otherwise, his app is here, and since he's been at the school for two years now people can know him as Brandon (or Bran). He's never publicly come out as Castor.