Barbarik

Barbarika
Barbarika worshipped as Khatushyam

Also, refer to Iravan, whose story is very similar

In the Skanda Purana, Barbarika,Baliyadev (IAST Barbarīka) was the son of Ghatotkacha and Maurvi (Ahilawati), daughter of Muru, a Yadava king. Barbarika was originally a yaksha, and was reborn as a man. He was bound by his principle of always fighting on the losing side, which led him to stand witness to the battle of Mahabharata without taking part in it . In Nepali culture Kirata King Yalamber of Nepal is portrayed as Barbarika.

In Rajasthan, he is worshipped as Khatushyamji, and In Gujarat, he is worshipped as Baliyadev is believed to have been sacrificed before the Mahabharata war to ensure the victory of his grandfathers, the Pandavas. In return for his sacrifice, he was deified by a boon given by Krishna.

Barbarika alias Khatushyamji Baliyadev alias Shyam was a grandson of Bhima (second of the Pandava brothers), and the son of Ghatotkacha. Ghatotkacha was the son of Bhima and Hidimbi. Even in his childhood, Barbarika was a very brave warrior. He learnt the art of warfare from his mother. The gods (ashtadeva) gave him the three infallible arrows. Hence, Barbarika came to be known as "Bearer of Three Arrows". When Barbarika learnt that battle between the Pandavas and the Kauravas had become inevitable, he wanted to witness what was to be the Mahābhārata War. He promised his mother that if he felt the urge to participate in the battle, he would join the side which would be losing. He rode to the field on his Blue Horse equipped with his three arrows and bow.