Something I think is funny is that it seems like Arthur from Ghosts 'n Goblins got into both Smash and Astro Bot just because the directors really liked the game and wanted to put him in. Sakurai implied as much when he was going over the Mii costumes for Pyra/Mythra and has repeatedly talked about his fondness for the original game, while Nicolas Doucet, director of Astro Bot, said that he pushed for Arthur because he loved Ultimate Ghosts 'n Goblins on the PSP in an interview with Skill Up. It's an odd coincidence.