Interesting theory! Although I don't think Plessie's officially connected to Yoshi by lore, it's a fun headcanon. Plessie being a protector definitely fits with the character's helpful role in levels. Also, I'd love to hear more about why you think Plessie likes bumping on Splounders. Is it just for fun …

Super Mario RPG was a masterpiece for its time! When that game dropped, it blew my mind with the graphics and that 3D feel of the characters was something else. Everyone still talks about Geno, right? I'm still holding out hope they'll add him to Smash one day... But seriously, …