Snake makes several cameo appearances in episode 2.
If you would like to see other non-sonic characters make cameo and reoccuring appearances, please list them.
I will try my best to add them in future episodes.

Note: The following will appear from Chapter 3 onwards... (Except Snake because he appears in Ch 1 Ep 2)

Mario
Link
Megaman

Do not list Zero (Megaman Series) as it will cause confusion with the other zero character