TheWispGuyさんのイラストまとめ

@Dhiqoo Kevin from Mario Tennis, specifically Power Tour.

Elroy & Tori may be arrogant jerks, but Kevin? He has one of his students throw you out of the Varsity court if you're not a Varsity member. Like, at least give me the chance to leave and only resort to that if I refuse, asshole!

@FranchiseWario With how Waluigi's character is nowadays, it kind of sounds like he's putting on a "tough guy" voice.

Though going by that New Years illustration Camelot posted back in 2015, it seems they may have initially intended for him to be a more sinister character.

Clay from Mario Tennis Power Tour has two different official art: One that has white sclera, and another that has it skin-colored.
I learned during a convo on Marioverse Discord that the latter also has a different wristband!
Guess the latter was early art that was later updated.

If Nintendo bought Rare, would Diddy Kong even show up in the Mario spinoffs?
Super Mario Kart and Tennis 64 used Donkey Kong Jr.
Double Dash intended to use Jr. as well before Diddy replaced him.
Diddy and the rest of DK's friends could have been in the same camp as Wario's gang

@ArcRay20 @FoursideKM Waluigi is also referenced in Paper Mario: The Thousand-Year Door if Mario wears both the L Emblem and W Emblem.

If it counts, there's also the Waluigi Costume in Super Mario Maker.

@AmiiboNews Pyra & Mythra, if I can. Min Min would be nice as well.

@SpuukyLIVE New Entries/Remake/Compilation:
-Wario Land
-Rhythm Heaven
-Golden Sun
-Mega Man
-Kid Icarus
-Nintendo Land

Special Mention:
-Pokemon (Allow us to turn off EXP Share, revert back to XY's Global Trading, etc...)

First Anime: Hello Kitty, Pokemon, Digimon, Dragon Ball, or YuGiOh
Last Anime: Sailor Moon S + The Movie
Best Anime: Fullmetal Alchemist, Digimon (all of them)
Worst Anime: Does High Guardian Spice count?
Anime Everyone Loves But You Can’t Stand: Nothing in particular

The Metal Sonic timeline

2-3-CD
Eggman builds Robo, improves it to Mecha, than finally Metal.

CD-2-3
Metal is abandoned in Stardust Speedway. Eggman builds Robo as a clunky replacement, improves it to Mecha, and it gets destroyed by Knuckles. Eggman retrieves Metal in 4/Mania.

In Mega Man Battle Network/NT Warrior, who is the older sibling: Ms. Mari or Ms. Yuri?
I kind of assumed Yuri was the oldest, especially since their concept art has her standing slightly taller than Mari, but that might just be because Mari's lowering her head a little.