General Kenobi is the second raid-exclusive character and thankfully actually worth the farm. (Sorry raid Han) He may be classified as a support, but brings strong damage and tank functionality too.
General Kenobi is one of the best characters in the current metagame, and may be the best plug-and-play character (It’s a close race with Darth Nihilus). He brings a team-wide cleanse, great buffing, an auto-taunt, and strong burst damage all on a bulky frame.
Lead
Jedi and Clone allies gain 30% Max Health and 70% Defense. After a Jedi ally uses a team healing Special ability, all other allies at full health are called to Assist, dealing 50% less damage. When a Clone ally uses a Special ability they gain a buff (Attacker: Advantage, Support: Stealth, Tank: Taunt) for 1 turn.
Technically you can use Kenobi as a lead. But just because you can doesn’t mean you should. Admittedly if you have no TM-boosting leader, Kenobi is probably your best choice. But if you’ve gotten far enough to unlock GK and don’t have another leader you’ve already fucked up.
Non-Lead
This is where GK shines. His amazing kit and versatility makes him worth a slot on any team. Every team wants a cleanser, taunter, and more damage, and GK brings all three of these with a bow on top.
Normally I’d talk about what needs you’re looking to fill that you should cover with GK. But really, when looking to fill a slot, GK is the measuring stick that you should compare against. Any other character has to bring more to the team with their unique synergies to be worth it over GK. GK is simply reliably good.
Synergies
When it comes to synergies, it’s not how you can help GK, it’s how GK can help you. Okay, that’s not entirely true. GK really wants his auto-taunt and auto-foresight to work, and would prefer not have to use his cleanse. So pairing him with another cleanser (or two, if you’re particularly sadistic) makes GK shine.
With regards to other characters, everyone appreciates a good cleanse. His team-wide Retribution means that you should look to pair him with characters with strong basic attacks. His team-wide assist chain only furthers this synergy.
Technically you could argue that GK also has a synergy protecting weaker characters with his Foresight-granting abilities. But basically every character benefits from Foresight, and none that are currently relevant to the metagame benefit from it especially so. The exception is a Darth Maul-led team. In that case you can probably do better than GK anyways.
Mods
General Kenobi basically wants every stat. Since his skills are so powerful, however, you’re best off focusing on Speed first and then survivability. Look for Protection, Health, and if you have to, Defense bonuses to bulk him up.
You can go for crit chance and crit damage on him. I wouldn’t recommend it unless he’s one of the heavy hitters on your team. Even in that case I’d consider not doing it anyways. Crits are heavily penalized in today’s meta and it’d be tough to get GK’s crits up to a noteworthy level.
Counters
General Kenobi is rather difficult to counter, which is why he pretty much works on every team. That being said, almost every team that is running him is relying on his taunting. Thus, Buff Immunity, dispels, and Shock are all excellent methods to reduce his effectiveness.
Beyond that, GK’s burst damage relies on allies being buffed. Having a team-wide dispeller, like B2 or Asajj, means that you can cripple his burst damage. Admittedly his burst damage isn’t why he’s going to be on a team, but it’s something worth watching.