eren yeager, shingeki no kyojin, highres, 6+boys, age progression, aida aot, animal hood, bandaged head, bandages, beard stubble, birthday cake, black hoodie, bolo tie, border, brown hair, brown jacket, brown shoes, cake, chibi, chibi on head, chibi on shoulder, closed eyes, confetti, facial hair, food, gakuran, green eyes, green jacket, grey shirt, grin, hair bun, happy birthday, hood, hoodie, jacket, long hair, male focus, multiple boys, mustache, on head, parted bangs, parted lips, pennant, school uniform, shirt, shoes, short hair, smile, stubble, suit jacket, survey corps (emblem), upper body, white border, yellow background