the idea of jason being immortal and damian knowing this since he was a toddler in the league and thus being like. the only member of the family who is used to and unaffected by jason dying keeps coming back to me purely because of how easy it then is to give those two the chaotic dynamics of spiderman and deadpool.
like, i want bitchy sarcastic jason who is completely resigned to the fact that that he can’t die and thus has become numb to death and injuries to the point where he’s like. completely given up on being careful. if he can’t die he might as well fuck around a bit, y’no? one time he and a bunch of other trainees were taken to the top of a mountain during a sandstorm and ordered to figure out how to get down without succumbing to the elements and that the person who got down first would be allowed extra rations and without hesitation jason turned, flipped everyone off, and jumped off the entire cliff face. when the remaining survivors made it down they found him on a deckchair sipping water from a bendy straw.
and damian being this little kid who jason just kinda found during his time at the league and went ‘ok so this is mine now.’ like i don’t want talia to have made jason his protector, i want jason to have skipped out on training because ‘whats my tutor gonna do, stab me?’ and he finds this little fuckin wayne kid out working through katas, and he’s like. holy shit. i want him. and he just starts hanging around with damian 24/7. damian isn’t 100% sure what to even do about this, but jason won’t leave him alone and is kinda great with kids and also is really helpful with helping teach him tips and tricks for combat training so like. he just ends up begrudgingly accepting and eventually relishing in jason’s presence.
to be clear, damian trusts jason with his LIFE. thats his insane mentor who sings too loudly and makes shitty jokes before decapitating a bunch of people who try to hurt damian. thats the erratic but incredibly skilled fighter who has endless patience for teaching and is probably the only reason damian managed to succeed during league training as a child. thats red hood, who is clearly messed up in the head but if damian asks for advice suddenly gets weirdly mature and wise about random shit. thats his guy. his buddy. but he’s also a fucking menace to society and he can’t die so like, both damian and jason’s reference for ‘brotherly roughhousing’ is SUPREMELY fucked by the time they get to gotham.
they end up giving the rest of the family fucking heart attacks.
Red Hood: and i’m bored. entertain me.
Nightwing: maybe we could-
Robin: *snatches Jason’s gun off him and shoots him in the chest*
Red Hood: *falls off the side of the building, landing in an alley with a SMACK*
Nightwing, fucking horrified: W-
Robin: there, that should give us a minute or two of peace.
Damian: how long does it take while burning alive for your pain nerves to numb?
Jason: huh. dunno. wanna see?
Bruce and Tim, looking up from the batcomputer:
Damian: there’s gasoline by the batmobile
Jason: i always did like the smell of gasoline. oil me up baby.
Bruce: what on earth are you two- OH MY GOD NO
Tim: DAMIAN PUT DOWN THE LIGHTER
Steph: *walks in to find Jason on the floor, skin slightly blue and unresponsive*
Steph: what’s wrong with him?
Damian, reading nearby: he was messing around and got a plastic bag stuck on his head, removing his access to oxygen.
Steph: holy- and he passed out-? WAIT HE ISN’T BREATHING- ALFRED! ALFRED!
Damian: what on earth do you think Pennyworth will be able to do?
Steph: WHY DIDN’T YOU HELP HIM?!
Damian: i put the bag in the recycling.