Captain Rex.

When Clone Wars ended previously, Rex’s fate was unknown. We later confirmed his survival, and his continued allegiance to Ahsoka Tano. E.K. Johnston’s novel Ahsoka revealed that Rex was with Ahsoka during the Siege of Mandalore.

Clone Wars Season 7

Outside of the main cast of characters, Rex is perhaps the next-most loved character of the series. Given Ahoska’s aforementioned pairing with Bo-Katan, we’re sure to see Rex, and perhaps even the moment he removes his implant to avoid carrying out Order 66.