Rakshasas and Rakshasa Warriors are both Lankan summons.
DnD does indeed have the Rakshasa. It's natural form looks like a humanoid tiger. Stats below.
http://www.d20srd.org/srd/monsters/rakshasa.htm
The Tigrans were a savage race - if I recall they had some of the strongest domination/enslavement abilities in the game, with an extra focus on illusion as well.