The Shortkings Addon do Minecraft 1.20.80

Description:

Have you ever wished that there was more variety to the look of the player? Or maybe you wish that you were just a little bit smaller than two blocks. With the Shortkings Addon players will spawn in with a new height and size whenver they die! By simply adjusting the scale of the player, you and your friends will all look wildly different from one another in your world. There's not very much else to this, but generally, smaller players are faster and bigger players have more health.

Pictures:

These are not all the sizes, but this gives you a sense of how this addon works. Generally, you are more likely to get sizes closer to the default player size, but sometimes will get one that is noticeably larger or smaller than it.