Keith Shardis was the head instructor of 104th Trainees Squad. He seemed to be a friend or have some sort of relationship with Dr. Grisha, as he knew Eren is the son of the doctor and praised Eren for his effort. He is a former Commander of the Survey Corps, and was in command when Wall Maria fell in 845. First Appearance Manga: Ch. 15 "One By One" Anime: Ep. 1 "To You Two Thousand Years Later" (Source: Shingeki no Kyojin Wikia)
One of Nezu's aids requesting a helicopter to land at Nezu's estate.
He's a ghost looking like a high schooler. He has almost no memory of his previous life (remembers only his own name), doesn't know how he died, when did it happen, who was his family etc. Usually he's friendly and cheerful, especially around Haram, but when left alone, he tends to drown in his thoughts. Actually, he's not a ghost, but a fragment of memory, and he did not die—his "real" self just wiped off some part of his memory because of a tragic event. That's when Gaon The Ghost was "born" and when the actual Gaon started to have partial amnesia, which changed a bit his personality, too.
Member of Scouting Legion that fought the Castle Utgard's battle.
One of four Pallasite Kings, the user of the Great Sword Tenjinsoseiken. He is calm and soft spoken, and apparently the most loyal of the four kings.