Names (I will give props)

Miranda, Priscilla, Roselynn, Serenity and Trinity for girlfriend and 15 year old with HIV

Austin, Phoenix and Xavier for the theater teacher, English teacher and best friend with the theater teacher

Theatre teacher (male): Mr. Elmenton
Male English teacher: Mr. Birkham
Friend with the Theatre teacher (male): John Cassanova
Female student: Stacey
Girlfriend for the best friend: Ashlyn

Hope this helps!!!

Theatre: Nikolas Hallisey (Mr. Hallisey)
English: Allen Harding (Mr. Harding)
Friends with Theatre: Dakota Curry
Female with HIV: Audrey Aaron
Girlfriend: Cara Messick

I just came up with random last names :P

One male Theatre teacher: Ezra, Declan, Brady

One male English teacher: Phoenix, Theodore, Casper

One male who is best friends with the Theatre teacher: Oscar, Keith, Liam

One female student who is 15 and HIV positive: Chloe, Paige, Natasha

One girlfriend for the best friend: Sadie, Lila, Margot

lemme suggest some japanese names
1- Nakaru
2- Nagasawa
3- Hiroshi
4- Natsumi
5- Nanako