Step 1: Alyzing Clue 1:
During their exile in the forest, the Pandavas encountered the Rakshasa princess Hidimba. She fell in love with Bhima and married him. Their union produced a powerful half-human, half-demon son.
Step 2: Alyzing Clues 2 and 3:
Since his mother belonged to the Rakshasa (demon) clan, he inherited magical, shapeshifting abilities and massive physical power. He was deeply devoted to his father and uncles (the Pandavas) and promised them that he would immediately appear to aid them whenever they faced danger.
Step 3: Identification:
This character is Ghatotkacha. He played a crucial role in the Kurukshetra War and was eventually killed by Kar, who had to use his ultimate weapon (Vasavi Shakti) against him, thereby saving Arju's life. Hence, the correct option is (D).