Only if you file it down to roughly the same size as the ds lite...
yes
I am assuming cases for the Ds. There are ones that protect the DS when not in use usually made of aluminum. There are also rubber cases that are in the shape of the DS that protect it when in use and it can be thrown around and still be in fine shape.
Does a reguler DS have a light on it?
No, metal cases are harder than plastic cases, but both types of cases offer protection for your Nintendo DS.
Nintendo DS cases can be purchased where Nintendo DS consoles are availible.
no a dsi is smaller than a ds
No... The DS(i) light blue color is brighter than the light blue color on the DS Lite
yes
you walk into the middle of the light and use the camera angle to look up.
you can play game boy games a normal DS but not on a DS light or a DS I.
No, just regular cases, but they still do help with waterproof.
Gamer Rage II DS Cases - 2013 was released on: USA: 16 June 2013 (internet)