The following is NOT canonized by the TTV. Anything listed serves as potential material for the TTV, if they ever want to use any of it. Anything they reject outright (assuming any of them read this) will be labeled Non-Canon.
Additionally, the following characters are from @Gresh113's Matoran Ideas thread, with all images by @Noupix. This thread is to help organize the Matoran into their regions, as well as track who would interact with whom.
Jaller: Narmoto's brother?
Sarda: Mangaian Elite Guard captain.
Kalama (@Noupix original): Mangaian Elite Guard; wounded in Vako Invasion while protecting three Ihuans.
Vohon (@Noupix original): Mangaian Elite Guard.
Furno (Hero Factory): soldier.
Kapura (female): soldier; initially rejected but later accepted by Jaller.
Balta: skilled military engineer/inventor.
Takua @UltimateMustacheX: wandering chronicler/cartographer, records the history/geography of the island; well-known.