I didn't see something like this get posted so I'll post it here.
These are just preliminary findings. I don't know if there are any subclasses - there could be, like how Kasumi and Ayane were super light in previous games, so feel free to add your own findings.
Light:
Ayane
Eliot
Hitomi
Kasumi
Kokoro
Leifang
Mila
Pai
Sarah
Medium:
Akira
Brad Wong
Christie
Gen Fu
Hayabusa
Hayate
Helena
Lisa
Tina
Rig
Zack
Heavy:
Bayman
Bass
Yes...some of this makes no sense story wise. Eliot is canonically heavier than Helena as far as I know, but he floats higher than her. Sarah, who's both taller and heavier than Helena (173cm and 55kg vs 170cm and 49kg), is also light weight.
These are just preliminary findings. I don't know if there are any subclasses - there could be, like how Kasumi and Ayane were super light in previous games, so feel free to add your own findings.
Light:
Ayane
Eliot
Hitomi
Kasumi
Kokoro
Leifang
Mila
Pai
Sarah
Medium:
Akira
Brad Wong
Christie
Gen Fu
Hayabusa
Hayate
Helena
Lisa
Tina
Rig
Zack
Heavy:
Bayman
Bass
Yes...some of this makes no sense story wise. Eliot is canonically heavier than Helena as far as I know, but he floats higher than her. Sarah, who's both taller and heavier than Helena (173cm and 55kg vs 170cm and 49kg), is also light weight.