Ship Ideas

While I think you have a lot of good options, it's actually, too many & I'm not a fan of requiring all the new characters.

I've narrowed it down & tossed in a couple along w/ the Cap Ships they go with.

No new characters needed as well.

Chimera:
  TIE Advanced v1 - 7th Sister

Executrix:  
  TIE Outland - Moff Gideon
  TIE Heavy - Crewless
  Sentinel-class Shuttle (or another Lambda / or TIE Boarding Craft) - Krennic + Stormtrooper

Executor:
  Nothing for now:  They just got Punishing One & that thing is forking up Fleet Arena horribly right now.

Negotiator:
  Jedi Delta Starfighter - GM Yoda
  ETA2 - Aayla Secura

Endurance:
  ARC170 - ARC Trooper
  Nu Class Shuttle - Cody
  V-19 Torrent - Crewless
 
Finalizer:
  FO:  Assault Lander - FOX

Profundity:
  Rebel A-Wing - Crewless

Home-1:
  B-Wing - Crewless  (Tank)
  Luke’s X-wing - Farmboy

Malevolence:
  Droid Tri-Fighter - Crewless

Raddus:
  Resistance A-Wing - Crewless

Leviathan:
  Nothing for now:  Better they fix Punishing One first before screwing up the meta fleet any worse.

Some fleets would still only be at 6 but I'm fine with having a little room to grow.
The stuff I mention above is all things that I think are CRITICAL & EASY both based on the existing graphics & shortage of the fleets.