Here is who I think should voice these characters
Kion: Jake Gyllenhaal or Andrew Garfield(the voice actor for Kion Max Charles did play a younger version of peter Parker in the amazing spider man films starring Andrew Garfield so it would sort of make sense)
Rani: Hailee Stienfield
Fuli: Zoe Saldana
Azaad: (use the same actor form season 3)
Nya: Zendaya
Jacob: Tom Holland
Kai: Robbie Daymond
Skylor: Olivia Holt
Amora: Dove Cameron