Edge's Sassy Blade from Sparks of Hope

[Pierce Ng]

Her Sassy Blade weapon skin resembles Ceruledge's swords from Pokemon Violet but is inverted.

Also, Edge and Ceruledge have their names "edge" as well as wielding swords.

 

[LeftyGreenMario]

Edge is just a common term related to swords, so you can't really deduce anything specific from these two.

As for color, it's probably just coincidence

Anyway uh both look like their heads are on fire so there's that

 

[Pierce Ng]

Edge has something to do with Bitter Blade when she uses Vampdash and Pyrostar; reflecting Ceruledge's fire typing and the ability to drain HP

 

[Pierce Ng]

You see both of them, they have fire powers