Character list:
Toa Helyrx - Canon Design | Inspiration MOC
Artakha - Canon Design | Inspiration MOC
Remaining 4 Toa Hagah (Bomonga, Pouks, Kualus, Gaaki)
Toa Tuyet
Lariska
Toa Orde
Toa Zaria
Toa Chiara
Toa Nidhiki
Toa Varian
Gold Skinned Being
Marendar
TTV has left open the possibility of doing more characters, but nothing has been confirmed, and it would only be after this first list is complete.
Probably not. They’re a group of unknown size of Fe-Matoran, not a specific character.
Already done:
The fact that the character doesn’t have a name suggests they weren’t exactly a key character. In fact, the character is never seen, not even in a flashback.