User blog:ChessGrandMaster/Opponents for SMG4 characters

For a viewer that watches SMG4 content for around 2 1/2 months, I’m looking for opponents of the following characters. I would be grateful in your ideas for certain opponents and connections. (SMG4 version characters only!):

Characters:
 * Mario
 * SMG3
 * SMG4
 * Grand Dad
 * Fishy Boopkins
 * Waluigi (Rejection Arc)
 * Meggy (Not sure if I should place her here)

Here are circumstances, though:

1. NO CREEPYPASTA CHARACTERS.

2. No real-life characters in it.

3. No internet memes.

Looking forward to suggestions!

Chess