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That's Rua's brother. He seems very sick.
Rua's Brother is a character in Rua's House which is located on the northernmost edge of Emain Macha. The house cannot be entered unless a player's character has completed Rua's Sidequest. Her brother is apparently sick, suffering from a permanent paralysis. When left-clicking on him no other interaction is possible except for receiving the brief description given above.