Celine and I did a voiceover of a segment of the Undertale "Genocide Run" storyline where Flowey meets back up with the player at New Home, showing things from a new perspective: Chara, the Fallen Child.

Celine provides the voice of Flowey/Asriel, quoting the actual dialogue from the game.
I provide the voice of Chara, using a script I wrote to show how I figured the Fallen Child would handle their reunion with their little brother.

...Uhhh, spoiler warnings, I guess? [shrug]

Undertale and all associated characters/music/etc. are (c) Toby Fox