It's not possible to transfer characters from account to account directly - the only way to do this would be deleting the char and then recreating it with same data (just different IDs). But it won't be implemented as it would give people easy way to sell their characters.
As much as I would like to move toons off my cleric's account. Well, not gonna happen.
holy fk i wish its possible i dont want my sin on account with all other characters