Nikola Tesla is an old man in his sixties. He's of average height, and fairly lanky looking [but not to the point of looking malnourished]. He's got pale white skin, bright green eyes, messy white hair, and most likely since he's on the run, the makings of a nice beard. Tesla was formerly a renowned Alchemist praised for his creation of 'Lightning Alchemy'. He was imprisoned in Central for committing the taboo of Human-Transmutation on his dead wife.
Back before he was a prisoner, he resided in the North. However, there have been sightings of a man in the West, near the old mining town of Xenatine. That's where Rose should start her search.
By the way, I hope you don't mind me thrusting your character into this solo mission--I thought it would make for some fun development. But I realize I might have jumped the gun a bit @_@