Janremi Blackheart is a non-playable character from Final Fantasy XIV. He's a bandit who appears in the main story.
A chocobo egg has been stolen from Camp Bentbranch Meadows. Luquelot asks an adventurer to find it. The egg thief appears to be a man from Luquelot's homeland of Ishgard, Janremi Blackheart. The adventurer follows the thief's trail to the Tam-Tara Deepcroft, and retrieve the egg from him.
He's a lancer who can use some of the basic skills of lancer class.