A random idea for a meeting between them after what happens to Shadede with Dmind and his fusion with the mirror version of Alvey, and a little more explanation of the mirror world and the relationship between the two.
Shadede has had contact with Dedede since long before his canonical fight in Florence, and he often uses normal mirrors to talk to him, since he hates leaving the mirror world because of the dizziness it causes.
Shadede enjoys teasing Dedede, especially because he always forgets how little his other version knows about his past, his parents, or his abilities due to the way the mirror works. In other words, while in the normal version only Dedede was affected by the portal, in the mirror it affected the whole family, which is why he knows about his parents and the secret one of them is keeping.
