Sometimes transliterated as: Raksasa, RAkSasa, Raakshasa
Rākṣasa means someone who causes harm, thus violating the principle of ahimsā. This is a serious offence and is evil karma. It is a general term applied to anyone of physically very violent nature. Sometimes though people have used the term patronimically, such as in the case of Ravana.
In many cases rākṣasas were cannibalistic. Cannibalism itself is a violent act, and hence, is considered a Rākṣasa act. Even in Tibetan texts, one can find mention of cannibalistic rākṣasas. Padmasavbhava is described having taken the form of a turquoise cuckoo bird to subdue the cannibalistic rākṣasas
"slar lho nub srin-po'i kha gnon du g.yu bya khu-byug tu sprul nas gshegs-so."
- P. 123 The oral tradition from Zhang-Zhung: an introduction to the Bonpo Dzogchen teachings of the oral tradition from Zhang-Zhung known as the Zhang-Zhung snyan-rgyud John Myrdhin Reynolds