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.
Nokama: matriarch of Naho
Hahli: treasure hunter; princess(?).
Helryx: leader of the Arbiters.
Dalu: Arbiter Lieutenant.
Vhisola: Elite Arbiter captain.
Colona (@Noupix original): Elite Arbiter.
Okoth: Elite Arbiter.
Maku: Arbiter; friends with Hewkii; koli player.
Evo (Hero Factory): chief helmsman aboard the Arbiter flagship.
Surge (Hero Factory): deck cleaner aboard the Arbiter flagship.
Idris: treasure hunter.
Kyrehx: treasure hunter.
Kotu (ideas by @Noupix): inventor and a friendly rival to Nuparu; formerly obsessed with financial success, later "reformed" by Nuparu to invent for the betterment of Matoranity; "redeems" Nuparu after latter is banished.