Edward Nygma:He whole-heartedly and unironically hates minions with a fiery passion. It's the source of many fights with Harley and Jervis. He also collects Rare Pepes.
Bane:Just...just DO IT! Break Batman's back! Rule Gotham! DONT LET YOUR DREAMS BE DREAMS
Jonathan Crane:he INVENTED the gothic meme, don't even tell me otherwise. It creeps the other inmates out when he reads them out loud, mainly bc he does so in the dead of night.
Killer Croc:Arkham is calm (enough), until, out of nowhere, Croc runs into the room roaring "John CENAAAAAA"
Ivy:"Why the fuck you lyin?" meme. In particular, whenever the Joker says anything. She has the audio saved on Harley's phone and plays it while he talks. She's also a fan of the "gal pal" meme for obvious reasons.
Deadshot:he likes a lot of memes, especially "mmmm watcha say", but it's still hard to-
Harley:"What are THOOSE?" Literally nowhere is safe. Sometimes she combines it with her old favorite meme, the dress meme, for terrifying "what color are THOOOSE?" results. She's always a slut for good memes
Joker:There's nothing like a good old-fashioned Rick Roll! Especially when you use it as a countdown to piss Batsy off while he's detonating that bomb! Also the Mcfreakin lose it meme, he tries to reenact that once.
Râs Al Ghul:Talia, stop telling everyone he's dead.
Selina Kyle:"Hoe, don't do it!" bc those are often words said in her presence and it's practically about her now. She also sends the Rihanna winking gif in any situation.
Harvey Dent:"Breadstick" meme, whenever meeting up for deals he makes sure there's breadsticks, so if things go badly he can flip to see if he grabs the bread and runs or not. He also firmly believes in the Berenstein/Berenstain multiverse theory...or half of him does, at least.
Jervis Tetch:"I lo-" meme and "X and chill". "Yes Jerv, we know, you love Alice so much, you want to read Lewis Carroll and chill with her-GOD DONT DO THE LOOK"
Talia Al Ghul:"Bitch, where?" meme bc Talia relates to being flawless on a deep and personal level.
Victor Fries:You've heard of giving life back to your unconscious wife, now get ready for years of disappointment and bitterness!
Oswald:Penguin, there's no need to feel down, I said, Penguin, steal those birds all year round,
Clayface:"you're a kid you're a squid" bc he can be both a kid AND a squid