R2D2 is one of the four event characters. Out of all of them is the most plug-n-play. It can fit it just about every team thanks to its versatile support kit.
Critically, R2D2 is durable and brings a wide array of tricks. Including multiple of the staple needs, such as cleanse and a psuedo-taunt, as well as some unique ones, like a targeted taunt and burning, make R2D2 a fantastic addition to most teams. R2D2’s passive stat boosts only further its appeal.
R2D2 effectively brings a taunt to the team. More notably, this taunt can affect any character. This is fantastic with characters that want to be hit, like Kylo Ren.
Its passive cleanse is another strong addition, but this is a staple for just about every team to have. It’s important to note that it only works with Light Side characters, but that still provides a lot of options for you.
The Burning debuff is unfortunately overhyped. While it is still a useful tool, it shouldn’t be something relied on. Today’s meta is cleanse-heavy, and while negating dodges is a nice trick, it’s not the silver bullet to Maul teams it was expected to be. Characters under a Maul lead can still end up in Stealth from Maul’s lead (if they’re crit) or Savage can cleanse them of the Burning debuff.
You have a lot of flexibility in how to mod R2D2. Speed is of course great, but let’s move past that. R2D2 is durable enough that most people won’t try to focus the droid down first. That being said, you want enough survivability to ensure that it’s a bad idea to focus R2D2.
From there, you can either focus the aforementioned speed. Or you can do more survivability, and use R2D2’s psuedo-taunt on itself. Or you can do damage – the droid does a surprisingly good amount of damage, especially for a taunter. Potency doesn’t hurt either, as long as it’s not overkill.
R2D2 relies heavily on two mechanics: buffs and debuffs. In the case of the former, a lot of its utility is in the shape of its mass stealth ability. Bring Buff Immunity to shut this down. Failing that, look for mass-dispels. B2 brings both of these abilities, and B2 seems a fitting counter to R2D2.
With regards to its debuffs, you can shut those down through the normal mechanics. Tenacity Up is great if you can get it up first. Cleanse if not. Both is best. Your normal culprits, like Chirrut, GK, and Rex all fit the bill.