This could come in many ways, but I think the best way would be in the form of some new separatist droids. Some that come to mind are:
B1 battle droid
BX commando droid
Destroyer droid (droideka)
B2 rocket super battle droid
Super tactical droid
IG 100 magna guard (rework)
General grevious (rework)
That being said, here's a commando droid idea, feel free to leave your own ideas for characters, reworks, etc.
BX Commando droid Separatist, droid, attacker Deadly, fast attacker that uses stealth to exploit enemy weaknesses
Basic: Surprise attack
Deal physical damage to target enemy and expose them for 2 turns. If commando droid was stealthed, remove 30% turn meter and lose stealth.
Damage: 4K - 6K
Special 1: vibro-blade slash
Deal physical damage to target enemy and inflict "bleeding" for 2 turns. If target was debuffed, reduce this ability's cooldown by 1
(Cooldown: 3 turns)
Damage: 6K - 8K
Bleeding: healing immunity, no bonus turn meter gane, and 3 DOT effects
Special 2: smoke grenade
Deal special damage to all enemies and remove 20% turn meter, with an 80% chance to inflict daze for 2 turns. If stealthed, stun the target enemy for 1 turn.
(Cool down: 4 turns)
Damage: around 1K - 2K
(Smoke bomb is meant to be low damage and used mainly for what it inflicts)
Unique: recon tactics
At the end of each of its turns, BX commando droid has a 60% chance to gain stealth for one turn. While stealthed, commando droid has +25 speed and +30% offense.
Zeta: +20% stealth chance and gain 35% turn meter when attacking while stealthed.
Health: around 17k
Protection: around 15k
Crit chance: 35%
(These stats are just relative, I designed BX to be fast, high damage, and low HP)
I put a lot of thought into this rework, and I hope all you guys do the same with yours. Thanks