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Karasu is a male hyur with long black hair, with black paint over his eyes. Unlike the other shinobi, his ninja garb is colored red rather than blue.
Karasu has a flair for theatrics, often narrating the situation as though he is the hero of a tale. Prone to giving nicknames, he calls the Adventurer a "horsebird chick" and refers to Oboro as the "dull one."
He evades capture several times throughout the storyline, though their attempts to strike him at Aleport resulted in him failing his mission to assassinate a pirate captain. He is chastised and given a stern warning by his mysterious boss when he claims a "reunion with old friends" resulted in the mark escaped.
After Oboro procured shinobi garments for the Adventurer, Karasu intercepted the shipment and hid the articles across La Noscea guarded by imperial agents as seemingly a test. He later left a note found by Oboro that he was going to strike their safehouse in Eastern La Noscea. Confronting him in Raincatcher Gully, Karasu is finally defeated. Before Oboro can execute him for his crimes, Karasu starts laughing and questions if "the dull one" truly believes he's the traitor. He claims that he was not responsible for the attack, but rather found the one who did: Master Gekkai, who gave him a choice to serve him or die (with Karasu choosing the former). Oboro remained in disbelief over this, but before he could do anything, Karasu leaped into a ravine and seemed to kill himself by activating an explosive, claiming the truth will be found at Candlekeep Quay.
Karasu later appears after Master Gekkai was slain at the shinobi's hands, now out of his garb and without face paint, having faked his death. He returns the ninja body armor he had taken earlier and tosses his ninja soulstone to Oboro. Though exonerated of his charge of treason, he declines the offer to return to the village, claiming it was always too stuffy for him and he still has much blood on his hands from when he worked under Gekkai. He departs to make his own way as a free man.