Scott: You don't really have a nickname for him,you just always make the joke 'I'll call you later MCCall'
Stiles: Detective
Brett: TALLbot
Liam: Little angry pup
Derek: Sour Wolf
Theo: hot psycho/beautiful nightmare
Ethan: crazy half
Isaac: You pronounce his last name,Lahay, as HEY
Aiden: Better half
Allison: Brunette Marida
Lydia: Strawberry and Arie
I know,these suck. But I'm running out of ideas and wanted to post