i see ur hc request and raise you: tell me all about ticklish!five, i love one (1) deranged old man
oh lord you have unleashed the beast within me
i don’t think five is the most ticklish sibling, but he definitely has his spots that rival the others
stealing a headcanon from i believe @peachytickles that five’s palms are deathly ticklish b/c of his powers
and, of course, as i think the whole fandom can agree, his knees are insanely ticklish as well, and his academy uniform always leaves them easily accessible!!
i don’t think his siblings would know about how ticklish his hands are at first. it’s not really a spot anyone thinks to tickle, but i assume one of them figured it out by accident, maybe allison with her long nails or vanya trying to be sweet and comforting and running her fingers over his hand and five gasps like he’s been shot and clamps his hand around hers
he was usually more of a ler when they were kids, pretending to be above it most of the time, but secretly finding a lot of joy in making his siblings laugh til they cried. ben was his favorite target.
however, when he’s reverted back to his teenage body, he quickly realizes that even his assasin training can’t make up for his small size and noodle arms. he quickly becomes the target of plenty of tickle attacks, and he hates it (or, at least, he pretends to)
his laugh is kind of all over the place; sometimes he’s all bubbly, childish giggles, but other times it’s loud shrieks and screams. either way, he’s threatening bodily harm on his ler through it.
he can’t use his powers when he’s not focused, and tickling makes him incredibly unfocused, taking away his greatest chance at escape
klaus specifically likes to do silly childish stuff with him (“this little piggie”, singing “itsy bitsy spider” while tickling up his sides, raspberries, silly things like that!) and it makes five so fucking embarrassedangry
also, five cannot take being teased, he gets so defensive and flustered. he will deny being ticklish while squirming and cackling beneath his ler and scream at them to shut up when they point out how he clearly is
you wouldn’t think it, but five can be a begger once you drive him to it. he stays strong for the first bit of tickles, but once you get him tired out or target a weak spot, he’s suddenly way less interested in murdering you and much more inclined to promise you anything to get your fingers away from his ribs
worst spots are his palms, knees, ribs, and his neck (specifically beneath his chin)
lower body tickles = getting kicked, probably, so his siblings have to hold him down well
once vanya made him snort while tickling his sides. she laughed so hard he got the chance to teleport away and he was so flustered, vanya deadass thought he would never look her in the eye again. about an hour later, he was back in her room, tickling her til she swore not to tell a single soul.