i will be starting this post by saying that i will not touch on his mental health as i have my own headcanons sure but i don't want to say anything without doing proper research (honestly probably won't even touch on it because idk, i'm not a mental health expert and i just don't feel comfortable enough to diagnose but there is truth about this post that i agree with).
Jason when resurrected woke up with the white streak, similar to how Rogue has her hair, white patches in his eyebrows and discolorations on his face and entire body (vitiligo). His eyes after the pit are heterochromatic with one blue and one unnaturally green, reminiscent of the pit as it is pretty much the same color and partial blindness in his right eye.
The Lazarus Pit did not erase all his scars as canon, we are keeping them and it only sort of "enhanced" him (i choose to make the superboy prime punch canon, there are other effects from this punch that i will explain in this post).
Moving on, across his face is a blast scar from the bomb that extends from his nose to his right shoulder. he has tattoos, i'm unsure as of right now what he has but he does have tattoos. one thing i am sure about is he does have piercings on his nose, ears very much like this art.
Regarding body wise he is tall, standing at 6'5 ft / 1.95cm. weighting probably the best he's ever weighted in his entire life thanks to The Pit.
As for everything that is weird about him, as long as Superboy Prime is alive Jason is unable to die (he is unaware of this and frankly neither is Prime.), having been through the trial to get the All Blades he does have them. Able to summon them out of thin air and uses those instead of the crowbars. he is never going to use the stupid crowbars.
now Jason may be big but he is not the brute of the family, he is not all his rage, Jason is able to feel emotions like a normal person and he's actually quite sensitive !
this post will be updated with more headcanons as i go along.
Yes their bond is nonexistent in canon. No I don’t need that to change but this was a fun exercise (+ I get to make Jason read a few things from my personal collection)