The "Big Green Man" (Guest) teaser.

Act Music as Rounds? (may not apply to every stage)

Sprite dump of V3 Fang + Evolution

Despite being Water (Or Mutated Chao) slime sounds

2/3 of them are references to

Sonic's Concept and is also a Skin in Sonic Superstars Cream's Debut (Though inconsistent looks)

A former 90s rival's (A red capped plumber guy) recent 3D platformer since 2017

That Hover Move.

It's like the OG game but less stiff.

Yoshi and Birdo cosplaying as Ichigo Momomiya

Basically

Valgallah's Cream's "Chao Force" Super

Command is

D,DF,F X+Y

(coming some time soon or something.) The 1st Sonic Battle Redux arcade Run: Sonic.

Some Rain booted artwork of these characters i did