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main cast
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kim yerim as mildred "millie" yoon
"i don't like boys like james. i like boys like you."

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ben barnes as sirius black
"what am i supposed to do, huh? just sit around while she's kissing every bloke in the school?"

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supporting cast
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aaron johnson as james potter
"do you reckon lily likes me back?"

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matt hitt as remus lupin
"never thought you'd be the one with girl trouble, pads."

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jamie bell as peter pettigrew
"why can't you just admit you like him back?"

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karen gillan as lily evans
"as much as i hate to say it, he's not a bad person. he's grown on me."

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park bo gum as benjamin "benji" yoon
"she's just lost right now. let her find her way back on her own."

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amber riley as demetria jones
"how come you can kiss anyone you like and yet i can't get the one boy i love to kiss me?"

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a few other characters will return, such as lucinda, marlene, and maybe regulus and snape.