Create rectangle shaped character with collision

I am in need in creating a character that can change shape, and still have collision.
I understood that capsule component are here for collision, and the minimum size is a sphere (and cannot we wider than the height).

But at some times i’ll need my character to be a rectangle, and the collisions cannot be avoided on the corners… (the rectangle can be wide and few pixels high, and the other way).

How can I achieve something like this ? Can I reparent the “ThirdpersonCharacter” to somthing else so I can do it ?
Or is there a way using capsule component ?