Ki Mendrossen

From Memory Alpha, the free Star Trek reference

Ki Mendrossen served as Ambassador Sarek's chief of staff when the ambassador visited the USS Enterprise-D in 2366. By his appearance and behavior, he seemed to be Human but his slightly pointed ears ad upswept eyebrows indicated the possibility of his being part Vulcan. He was very protective of Sarek, and declined to allow Picard to give Sarek a tour of the ship, explaining that Sarek's advanced age made him easily tired. Mendrossen was trying to hide that Sarek was suffering from symptoms that were later shown to be the result of Bendii Syndrome, a rare disorder which causes loss of emotional control in Vulcans over 200. (TNG: "Sarek")