Light Yagami/Harry Potter
Light tried to think back to his previous memories.
A flash of green light. Lots of pain. A nursery. A man dressed in black hugging a red haired woman's corpse. Then the giant. Somewhen between the two events, the previous man disappeared. How? He went out a window? Or hid somewhere in the room? Something to think about later. After that came Light's embarrassing display of crying and a panic attack. Then a man hugging him who, on second thought, looked nothing like L except his hair, atrocious dressing sense and defeated eyes.
"Take the baby inside first, Pet," a male voice sounded. Light absently observed his current surroundings and tried to recall more information. "The neighbor's might see him. And keep your voice down. We don't need more questions."
Harry. This body's name was Harry.
And that accent was positively British. Light would know. L was raised in a British boarding school. So were Near and Mello. Despite how much they tried to hide it, they still tapped over their 'r's when in deep thought. Light had carefully examined each and every interaction between himself and those individuals, trying to find some weak link. Instead, he found their British origins and a boarding school for orphans in Winchester, England.