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Tim: Bart, you have to stop stealing my siblings.
Bart, leaning on Dick, legs over Jason's lap, getting his nails painted by Steph, getting his hair braided by babs, and showing cute animal pics to Damian: I have no idea what you mean.
Okay so now is time for the long rant of Dick and Bart's dynamic. I'd like to state rn before anyone @/s me, I don't ship these two romantically, if anything it's more brotherly companionship than anything.
To start off, Bart would definatly be broken up about Wally's death just as much as Dickie would, and in a weird sense they'd have sort of an understanding. After Wally disapears, Artemis goes off grid so it's not like he can talk to her. Barry is off-limits for obvious reasons. (honestly some things Barry's said in the comics makes me feel like he blames Bart for Wally) More often than not, Bart would go to Bludhaven to talk to Dick and find comfort. Dick was, after all, Wally's best friend. And Bart would give him the same comfort.
Dick had already known Bart, he's seen him hang around the mannor, following behind Tim like a puppy with it's tail wagging. For a long time, he'd thought the two were dating with how close they were. Dick, being the awkard brother that's trying his best to get closer to his siblings would try and get to know his friends better and Bart really enjoyed his company whenever Dick stuck around.
Before Wally's death, Bart would always do anything and everything to make him jealous, upset, or a combination of the two. So every time Dick and Wally were in the same room with him, Bart would use his pick up lines on Dick just to piss Wally off and it worked every time. Dick, of course, knew what was happening because Bart had given him a rushed explination before he started doing that and he found it hilarious how Wally's face matched his hair as he dragged Bart away with the younger speedster yelling out "CALL ME". Tim pinched the bridge of his nose when he learned of this and Jason finds it hilarious as well. Damian, not so much.
Bart would definatly give Dick all the hugs, and Dick- being the touch starved boy he was with brothers who aren't too touchy and neither was Wally- always allowed it. He never really did anything in company but whenever they're having silent time just hanging out Bart would lean up against his shoulder or lean back to back with him. Speedsters are also actual furnaces so it's nice in the winter time. Dick would return the affections by a random hair ruffle in public or a touch to the shoulder to show he was there.
Just Batboys and Bart things
So we all know Bart and his dynamic with Tim, but honestly there's so many possibilities. Hi, if you're new here, I rant a lot about how Bart and Jason would get along wonderfully.
Anyways, Bart and Damian. So we all know Bart, once he dies, for some reason always comes back younger. (That reason is probably cause DC creators only see him as comedic relief and keeping him young keeps his spark but I'll leave that for another time). So eventually, When he comes back from death as Impulse, same age as Damian, after previously being as old as Tim (which is just weird), we have a blooming friendship.
Now obviously, Damian- bless him- is our snobby little prince with serious attatchment issues and good sense of humor. I feel like Bart would bring out a totally different side of him tho. We all know About Damian and Colin, or Damian and Jon, but Bart is just different from them.
As I've stated in my JayBart rants, Bart and Damian would definatly hold that sort of mutual understanding of what it's like to die and come back.
But other than being a total prankster and fun loving kid, Bart has his moments when he's got this off-shore wise part of him that has great advice. (such baby) I feel like Damian trying to shed away his teachings from the LOA and trying to fit into his newfound clusterheck of a family would be really hard for him. Obviously Bart knows a thing or two about that, seeing as him and his own family didn't get along either and they had no idea he existed until he showed up one day too, so Damian would see this side of Bart whenever he gives the Robin advice or just talks that no one else really sees and thats just so... hgggn
Also, Bart would definatly try to teach Damian how to have fun and invite him to tag or hide and seek and only get Damian to play when he says it can help in tacticality and training. He'd be very patient the entire time with him, and ends up having fun anyways. (Accidently breaks more than a few vases in the manor durring tag, oops)
Bart is also basically immune to rude comments since he's just too aloof to either notice them or care. (Legit, joker calls him an "obnoxious, fleet-footer, super brat" and all Bart does is think for a moment and say "no I'm not") Anything Damian throws at him he'll laugh along too. Also, 90% sure Bart would get Damian to smile a lot when people aren't around and he calls it a win.
Since Bart was trained in combat by Timmy and the LAPD and he has superspeed reaction time, he's a great spar partner for Damain. Dami uses him mostly for hand-to-hand or vent sparring and Bart is completely okay with this. His reflexs to all the punches and kicks are perfect for a moving target and keeping the fight going for longer.
There's a lot more I can say on this but I'll end it here. Y'all are probably like "Who's gonna read this long heckin thing" and I'm wondering the same.