Misa is a famous model, singer and actress and has an immense crush on Light Yagami. She usually refers to herself in the third person by calling herself “Misa-Misa” and tends to be hyperactive. She poses as the second Kira to attract the attention of the first Kira.
She decides to devote her life to Light because he punished the criminal that killed her parents when she was younger; a burglar killed Misa’s parents in front of her eyes. Misa, unable to forgive the killer and wanting to kill the burglar herself, saw multiple delays in the killer’s trial before Kira killed him. The Shinigami who follows her is Rem. Misa also performs two eye trades, cutting her lifespan in half twice; the first was with Rem, and the second with Ryuk.
According to How to Read 13, Misa falls into despair after learning of Light’s death through Matsuda. Misa commits suicide one year later on February 14, 2011. It is also revealed that the cloaked woman who appears at the end of the manga is not Misa, but simply a follower of Kira.
At the anime’s finale, Misa’s suicide is neither mentioned nor seen. At the final credits, she is seen standing at the edge of a rooftop, with a sad face looking at the horizon.