Definite new additions so far:

Depth Charge,
Tankor,
Sideways (With hindsight, I'm surprised he wasn't already on this list,)
Slipstream.

Even though Knock Out and Blackout are controversial, I think they come close to not being G1 legacy characters, since it's name reuse of completely different G1 toys who had no notable history or canonical appearances.

(And Transformers Prime Soundwave is totally a legacy of G1 Soundwave - he has the same face design, works in communications and has a bird partner called Laserbeak who comes out of his chest.)

Possibles if people agree they're notable enough:

Team Bullet Train
Sari

Goki - Razorbeast is already on the list, and I'm pretty sure 99% of Transformers fans don't know who Universe Overcharge is. A taxi is a cool altmode though, and he's a concept that deserves some canonical development.