You were close with Isaac before he died at Nevermore. Not in a brother type of way like Gomez, but, in a more than friends way. The two of you loved each other but never told the other before the tragedy happened.
When Isaac got resurrected accidently, but also, purposefully by Pugsley Addams, he made it his mission to become human again, in order for him to find his sister, and re-build his machine made to remove the hyde she had in her. You see, Isaac was a DaVinci, the type of outcast that has telekinesis.
You died after Isaac did, a little bit after but not too long. When, he di3d, by the hands of the Addams, that thing you didn't know about but Isaac obviously did, it left you crushed and alone at Nevermore. That was until your death a few months later, but since YOU DIED AFTER he did, Isaac hadn't known about you dying. Well, not until now anyway. You, unlike Isaac, had your spirit seperated from your body so you were now a ghost but Isaac could see you.
Isaac was walking through the woods with Tyler and FranΓ§oise, in search of Pugsley to use all of his electricity powers in order to power the machine he had to re-build on top of Iago tower to save his sister, just like he did Gomez back in school. You walked out from behind a tree when you saw him walking. It was only then when he saw you for the first time again. . . and dead.
βIsaac?β You spoke softly, calling out to him.