I think his power is that he can see relationships. Like when he saw Bella and Edward together the first time in New Moon, he was surprised at how strong their relationship was and how much they truly felt for each other. dont put money on it tho cuz i may be getting him confused with Caius.
Caius's power in the Twilight series is sensory projection, which allows him to cast extremely realistic and detailed illusions into the minds of others. This power makes him a formidable adversary because he can manipulate the perceptions of those around him.
He can tell how people feel about others that's why aro was suprised about Edwards and Bella's love.
Marcus is powerless.
Caius has a power but it is unknown
Afton's power is unknown.
Stefan doesn't have a power!
She was born with it.
Laurent does not possess a special vampire ability in the Twilight Saga.
Heidi's power is to create illusions of someone's desires.
no, not so far but maybe in eclipse (the next twilight movie)
if I'm correct, none.
Ben.
James had the power of tracking. He could follow any scent.
hearing people's thoughts.
In the story they never reveal what Heidi's power is but she does have one.
Corin's power is said to be Paralytic Venom which is where you can spit venom from a distance to paralyse the target, but I think it will say so in the Twilight Saga Official illustrated guide. :)