The supreme personality of godhead Krishna is the fountainhead of all incarnations. Lord Balarama story, he is his second body. They are both one and the same identity. They are differ only in form. Krsna, his elder brother Balarama, locally known as balabhadra and his younger sister Subhadra. Some people say that Krishna is Vishnu, Balarama is shiva and Subhadra is Devi. It represents the forms of Vishnu, shiva and Shakti.
Lord Balabhadra was a son of Vasudeva. Balarama character is very different from lord Krsna. Balabhadra is fair and has smooth straight hair while lord Krishna is dark with thick curly hair. Balarama wears the blue and the Krishna wears the yellow dresses. He associating with the agricultural activities and god Krishna carries a flute and associating with the animal husbandry.
In mythology, the hermit shiva is bholenath, who often very innocently gives boon to demons. In the epic, Lord Balabhadra is the innocent shiva while Krsna is the wily Vishnu. The greatest difference between the two brothers is that while Krsna favored the Pandavas and Balarama favored the kauravas, especially duryodhana.
Balarama was so happy with duryodhana because he wanted his sister Subhadra to marry with him. He said Krishna to pacify his infuriated elder brother; she is holding the reins of the chariot. She wants to go with him. Who are we to stop her?
Years later in the great war of at kurukshetra, directed by Krishna. When Balarama learns of this, he is so angry for this breach of war rules that he raises his plough to kill Bhima. Krsna stops him. He lowers his plough and forgives Bhima, not because he understood the complex argument of kanaiha, but the ascetic form of god had faith in his younger brother Vishnu, the more wordly form of god.