I swear you are telepathic because I feel exactly the same! He definitely enjoys letting slightly loose from the strict academy reputation he has to maintain, but definitely the kids come first! I wonder how he handles Naruto’s first Halloween though…
I have the idea that maybe Naruto dressed up as a mummy because toilet paper is prolly cheaper than anything else he has on hand, except some neighborhood bullies maybe idk pushes him into a puddle on the way to the Academy… so there goes the costume… and when he gets to the Academy unfortunately half-naked Iruka is like that’s not decent, you can’t wear that!! And then gets the story. And… rigs up a costume for Naruto real quick, after he gets Naruto a suitable shirt.
Maybe rips off half his cape and puts it on Naruto, chops a bit of a branch off a tree with his mad ninja skills (ie. a kunai) and is like there. Don’t you dare go throwing that branch around.
And Naruto is like, what is this??? I don’t wanna be something lame.
Then Iruka says, you’re a vampire hunter obviously! and, here he tears open a packet of ketchup and like spurts it onto his shirt, you can tell everyone you hunted me.
Naruto acts all annoyed but secretly he’s estatic. He still keeps the torn cape and the branch.
Man, I did not expect to come up with cute Naruto and Iruka fluff, my love for them is stronk today.
As for Kakashi, I bet he’ll like to tell scary stories and act unaffected about it. Maybe Team 7 gets the bright idea to do the 100 candles ghost stories telling thing (Naruto wants to do it, Sasuke secretly wants to do it, Sakura goes along bc of her then-crush on Sasuke) and then they invite Kakashi. And Iruka gets pulled along, because obv reasons. His stories tend to be kinda bland at the beginning, to lull them into a sense of security.
Imagine the lowest effort story ever, like, a girl walked down the road and then it opened up beneath her because it was a sandpit that wasn’t filled. and she stayed there for an hour before she got rescued. Shit like that. And Sasuke is scoffing, Naruto is like THAT’S LAME, and Sakura is like yeah, Kaka-sensei, that wasn’t even scary! Put more effort into it! And Iruka is like, I don’t know, I’d be pretty scared if a sandpit opened up under me. And Naruto interjecs, BUT WE’RE NINJAS.
and then near the middle he’s like, oh i got another one, and they think it’s another lame one, except he gets a slightly creepy story like a boy who wandered in the woods but could only get out by running away from the voices, a pair of siblings who had to wander the corridors of their school because the exit had disappeared. And it ramps up, until even Iruka feels chills down his spine.
Yeah, I think Kakashi would be enough of a troll to do that.
Meanwhile, Iruka is scaring the rest of them with ghost stories about the academy. And about the hokage tower. And maybe one or two about disgruntled chuunins who died because they received bad paperwork.
Hey, who said he had to be subtle? 
Or if they made the special effects later!!