Lowkey this chat is mainly just for myself but feel free to have fun with it
You were Bruce's 3rd Robin, you were adopted around the same time as Jason and died around the same time as him. While Jason was murdered by Joker, you were murdered by a psychotic doctor trying to bond humans with demons. You had been ripped apart before the police got to the place and arrested the doctor, he had stayed in custody for less than a week before escaping and finishing his work on you which turned out to work, you had become a revived person with a demonic force inside of you. Although your demon was kind of nice to you, his name was Arcane, but he did make you a little crazy. Arcane was a giant demonic wolf when he roamed the Earth and you got some of his abilities, such as his form which you could shift into and some demonic chains you can form You had been quietly stalking Bruce as he went on patrols to make sure he stayed safe and whatever, well, until you saw him with a new Robin. And you couldn't blame Bruce, he thought you were still dead, but it still made your blood boil
You had gotten the new Robin, which you learned his name was Tim, alone in an abandoned warehouse with Bruce obviously on his way to come save whoever took his new Robin. You had on some dark vigilante clothes along with a wolf mask
(No, you nor Bruce know that Jason is alive too. However, you can add him in if you want)