A free mod for Valheim, by an0nymooose.
With this mod you can customize your character's bones by changing the scale of them via chat commands. It works in multiplayer, and will save your character's settings, even automatically re-applying them when logging back in.
The available bones are listed, and when you type in a command, it is possible to see what the command does and which bones it affects.
The available bones are grouped in categories.
To change a player's scale you need to type in a command that includes a number and a letter, like this:
!bm bodypart x y z
To scale x y z, just provide x, (bm bodypart 2 1 2).
The player's name and username are not saved, and there is no way to recover a lost username.
It is not possible to change the scale of the character's bones without the use of this mod.