The idea of the Batkids doing normal people things while suited up is hilarious to me, you know, like Red Robin and Spoiler making the 9 o'clock news while racing through a grocery store because they totally forgot to get the things Alfred asked them to bring for the family dinner. Or Damian and Dick swinging into the Bludhaven Zoo mid-patrol because Dami really wanted to see the new baby tiger. Red Hood buying lemonade from a kid's stand and then standing there awkwardly messing with his helmet, trying not to hurt the kid's feelings. Black Bat, on a particularly tiring day randomly appeared in the nosebleeds of the ballet hall and started sniping phones out of people's hands. Or Signal and a deeply irritated Batman changing out a blown-out tyre in some back alley, earning amused looks.
Danny's human half dying as collateral during a fight. That human half goes into reincarnation and is reborn as Damian Wayne. He isn't born with all of his memories but he definitely feels that something is wrong. they would get their Memories Back at about 8 and have a horrible time dealing with being an assassin. Danny would try to stick to the personality they already had before but there's definitely slip-ups of them being like yeah this is wrong and Talia thinks they take after their father because of it.
The first thing Danny does when they're not being monitored by their mom or the bat family is to look for Phantom. Phantom to have run away to the ghost Zone and has built a reputation as a merciless ruler. He's a good ruler and he's not a tyrant but he doesn't have the reputation of kindness. Damien as the moral compass of the duo is really funny to me.
There's a situation later that involves ghosts which is where Danny/Damian and Phantom meet again. I want there to be a very big misunderstanding that heroes think Phantom is obsessed with Damien but in reality they are literally other halves of a soul. Phantom keeps doing and saying things that no one else would get away with around Damien. Phantom would be saying things like making fun of his height or giving him nicknames but as far as anyone else sees Damian doesn't even flinch.
Danny/Damian and Phantom have lived Separate Lives for a while so they don't automatically fuse into one person. I think they would fuse for a few hours just to feel themselves be one Soul again but they have Separate Lives so they can't stay that way. The bat family is very concerned with Damien continuing to talk to the obsessive ghost that keeps possessing his body.
Tim, suddenlly looking up: Oh My God
Dick: What? are you okay? What happened?
Tim: I just realized why Jason keeps making jokes about how he died
Jason: Yeah, because I died. It was a fairly big thing
Tim: No, it's because nothing else happened when you were Robin
Jason: What
Tim: Dick's the original Robin and the first sidekick, not to mention Discowing, so he has a lot to joke about-
Dick: Hey! Discowing was cool
Tim: No it was not. Neither was Ric without a k. Never be anything but Nightwing
Dick: Aw, you like it when I'm myself
Tim: No, I'm less tramatized when you're yourself. Anyway, Steph started a gang war, Demon Brat died and came back to life and is still Robin, Duke's not Robin but he started We Are Robin and jumped out of a police car before being a vigilante and I have my own things that we don't need to discus-
Dick: Saved the world in a intergalatic baseball game-
Jason: Hid the purchase of your own batmoblie in the batarang expenses-
Dick: Sunk around and took photos of vigilante at the age of 9-
Tim: THAT WE DON'T HAVE TO DISCUSS! Back to what I was saying, Jason's the boring robin
Jason: Rude-
Tim: You were the good robin, the little crazy shit you did like steal the tires off the batmobile were kinda overshadowed by the fact that you like Jane Austen and you been red hood is because you died so everything you've done since then still has to do with the one thing that happened to you as Robin
Dick: Oh My God. You said you were sticking to the same joke over and over again so it would have the same effect, but really you have nothing else to make jokes about
Tim: Exactly!
Jason: We really don't have to talk about this-
Tim: I need to go tell Steph immediately
Dick: I need to go tell everyone immediately