How do I change Frisk's sprite into Chara?

[HeyStayAwesome]

When the youtuber Mithzan did his genoside run in Undertale, he changed Frisk's sprite into Chara. So I want to try and do that myself, does anyone know how I could do that?

[eden :3]

Look it up online...IDK..im literally just surfing the internet and replying to random stuff(Check out the conversation i started..if you want,no pressure or anything )

[Jern]

you change the sprites which i havent dug into the files so i dont know if its code or images

[tr1n1ty]

You can change the sprite by swapping the files around in the game files but thats my guess idk really how to do that

[dat_potatoe]

http://aminoapps.com/page/undertale/4049810/how-to-mod-undertale-a-tutorial