Students and gender:
The bullies:

Zip-female

Oliver + edward- male

Nerds:

Kevin + Cubby + robby - male

Loud/chaotic students:

Ruby + riley - female

Skell and cubby - male

Failures:

Abbie-male
Lana + Claire - Female.

Nice students:
Bubble + claire - female
Engel - male 

Dress ups:

Lizzy + petunia - female

Teachers:

Miss circle-math
Miss bloomie-science
Miss thavel-language
Miss sasha-???
Miss Emily-???
Mister demi- music teacher + male
Miss grace: the principal