In later life, he served as a general under Sugriva and killed Kalanemi, and oversaw the construction of a bridge from India to a nearby island.  
After another god knocked this god out of the sky, this god's father got angry and gave all the gods upset stomachs until this god was granted immortality.  He was created from an item which was captured by a bird before it could be eaten by Kaikeyi, the youngest wife of Dasaratha.  That item, a cake, was found by the wife of Kesari, a queen named Angara.  In later life, he served as a general under Sugriva and killed Kalanemi, and oversaw the construction of a bridge from India to a nearby island.  The son of the wind god Vayu, he is depicted as having a red face and a very long tail, and was created to help Vishnu in his incarnation as Rama.  FTP, name this being who came to the rescue when Ravana abducted Sita, the monkey god of Hindu myth.
After another god knocked this god out of the sky, this god's father got angry and gave all the gods upset stomachs until this god was granted immortality.  
Hanuman