Imagine...
Tommy has been exiled
Ranboo starts to gather supplies inside L'Manberg for Tommy because they Idk meet up or smth?
He somehow meets ghost Schlatt
Schlatt asks why Ranboo would help Tommy after he caused a potential war
Ranboo being like, "Its because he's alone and my friend, nobody deserves to be alone."
Then Schlatt scoffing or just dismissive, "Some people deserve to be alone"
Ranboo stopping what he's doing then looks at the ghost dead seriously, "I know what its like being alone, I wouldnt want that for my worst enemy."
Schlatt finding some sort of emotion in that, "I'm not sure what they told you but...I was alone. I was ruling a country where everyone had turned against me. I was only doing what I thought was right - if you make people fear you then they'll be too scared to turn against you. I turned to drinking to down the loneliness and sadness - it was my only friend. Me and Wilbur used to be friends, as close as Tommy and Tubbo used to be, we survived our homes being destroyed together. Our first home was to a flood that destroyed everything - the second was to a volcano. We had lost each other while finding our new home but when I finally found him, he wasn't the same so I exiled him to keep the pain away of seeing how much he changed. I relied too much on my only friend left and it killed me. Nobody mourned. Everyone celebrated. I was truly alone."
"Well you aren't alone now, I'll be your friend. You wont be alone again."
Imagine if ghost Schlatt somehow remembers everything or at least enough to try and cause havoc and since most of L'Manburg only knows about Ghostbur they may blame him. This could somehow lead to Wilbur remembering or possibly try leaving or just something angsty.
On the other hand...
We could have ghost Schlatt and Ghostbur become friends over lost memories and happiness