how to make a hit box constantly active on a character

[Guymcguy087]

I am trying to make a character mod and I want to know how to make a character have a hit box past a certain speed, kinda like a pseudo dash mode

 

[Zipper]

Characters already have a hitbox, so you can just override their collision behaviour using the MobjCollide/MobjMoveCollide hooks to behave differently when going past a certain speed. Alternatively, you can create an invisible object with a large radius and make it constantly teleport in front of the player, and use THAT as your hitbox.