Raziel

They're the keeper of the secrets of the universe. They were sent to Earth to attempt to get the artifact from Rodney. He, particularly, was sent to attend school and contact Rodney that way. Likes cream soda! 

He can get overly violent when provoked. 

His halo is shown as his hair and jewelry

he has to attend high school which is cool and all but he just doesn't understand algebra... everything else? yeah okay. but math? Fuck dude, he doesnt get math...