The god Durga
Durga is one of the forms in which Shakti, the mother goddess appeared at the call of the gods to fight the demon buffalo Mahisha.
She's a warrior. She wears a red sari symbolizing the action and destruction of the demons. She has several arms because the gods have each given her a weapon to fight: the Vishnu disc; the spear of Kumara; the bow and arrow of Surya, the god of the sun; the ax of Chandra, the god of the moon; a mass of Yama, the god of death; the ax of Agni, the god of fire; the conch of Vayu, the god of the wind; the trident of Shiva.
So armed, she set out to kill Mahisha by riding a lion. It is often represented with eight arms.