Jean Kirstein is a supporting protagonist in the anime/manga series Attack on Titan. He is a graduate of the 104th Trainees Squad and graduated in the top ten of his class. Being Eren's rival and often at odds with him, he serves as the series' foil character. A cynical and hot-headed young man, he comes into constant conflict with Eren over their differing ideals. He declares his intention to join the Military Police Brigade, wanting only to live a comfortable and safe life. After the battle of Trost, he abandons his selfish ways, enlisting in the Survey Corps and growing into a capable young leader.