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I've thought an embarrassing amount about RGB laughter let me speak my truth real fast because fuck I love. The happy noise its so cute
BF has an obnoxious (endearing) belly laugh that's loud and I think he'd be prone to laughing so hard he starts snorting trying to take breaths. Fist slammer also
GF being a demon and I also write her being able to purr so this is very niche but breathy, rumbling giggles that repeat over and over until she's got tears in her eyes and covering her mouth with the back of her hand
Pico probably tries to hold his laughter in for as long as he can because he's Mysterious and Edgy and people like that clearly do not devolve into fits of giggles but honestly just push his buttons enough and you're getting wheezy hiccups and a face splitting grin, maybe flushed cheeks too because he tries to regain composure and just can't