No sad backstory here but it would be funny if Damien met doof reader all because of inheritance.
Like when bruce was 16 he wrote a will that gave doof reader EVERYTHING with the wayne name. You know just in case he died while training. Later he thought about changing it but figured his other adopted kids were well off and reader clearly needed it as his only, in his eyes, normal child. (I like to think bruce wholeheartedly thinks that doof is his only normal kid and has no idea they've teamed up with lex and has "battles" with clark).
So fast forward Damien arrives becomes Robin and chills out. Then one day bruce has his lawyers over and he's going over his will again and Damien over hears. Bruce has decided to split the wayne fortune between both of them but gives Damien the manor for obvious reasons. Damien is intrigued cause he's never heard of doof. Que him spiraling into a rabbit hole.
Later on during one of superman and doofs "battles" Damien shows up with Jon, who reader has reprimanded clark over bring to battles multiple times cause children no matter how superpowered shouldn't be near villain fights. They immediately get caught and teleported to Vanessa's playroom.
Now, Damien has met his niece and has been recruited to help her prove their parent is evil. Really, Damien just wants to get closer to his only blood sibling and now his niece. Meanwhile, Jon just likes hanging out with Vanessa and Damien.
Also, speaking of Jon, I feel like doof would get really mad at any of the heroes for involving kids as sidekicks. Mainly just because doof reader had a horrible childhood and is a mother/father themselves. So the first time clark brought Jon to one of their "battles," it was the first time clark saw them really mad. Unfortunately, once Jon met Vanessa, he's been showing up to their fights just to hang out.
Doof thinks clark intentionally brings Jon and this continues till one day Jon comes over by himself and doof realizes they've been wrong. Doof apologizes and they all have a nice dinner where Vanessa tries to secretly tell clark doof is a villain. Doof is actually a good cook.
Yaya All that good inheritance stuff
If it weren’t for bruce remembering to do that and if all the other batkids didnt already have a source of income it’d be an episode of succession over here (ive never watched the show)
Since Doof!reader is an adult they already inherited a good portion of shares and money so the only reason they dont have everything is cuz Bruce is alive
So if they did ever inherit anything it’d be NOTHING compared to what you already have and have made after inheriting because passive income and what not
You already own and manage a branch company for Wayne enterprises you already have a good half of your inheritance
In this instance tho the only person other than you in the inheritance would be Damien but now its very minor and stuff he can only have once bruce is dead so..
Once he realizes this and now knows if the existence of a blood sibling, an OLDER blood sibling, one born out of two well known families too
He probably asks bruce and Alfred about you which leads to the rest of the Batfam to know of your existence (not Dick, tim and jason)
And bruce tells the truth about how he was married only to have a kid not out of wedlock and to inherit everything if he didnt make it back one day
Then Damien goes scouring around trying to find any trace of you to find you and show you he’s superior.
To cool down jon takes him to a patrol with his dad since he’s never seen Damien like this
And his dad just so happens to be on his way to stop his ‘evil’ scientist friend
And I feel like Reader knows supes takes jon with him to play with Vanessa and they appreciate it
But still ends up scolding clark for having a child sidekick
Also Reader sees this as an opportunity for Vanessa to have her own nemesis
I think real doof wants Vanessa to be evil/just like him so this would be cute
Imagine damien trying to act all grown up towards a kid only a couple years younger than him