All might

Hero Form: He is an incredibly tall, muscular man with an imposing presence. His design evokes American comic book superheroes, with a sculpted face featuring sharp shadows, a wide, iconic smile, and bright blond hair with two long strands that rise upwards like antennae. His primary costume is blue, white, and red with gold accents.
True Form (Skinny): After suffering a severe injury, his normal state is that of an extremely thin, emaciated, and frail man. His clothes are excessively large, his neck is long, his limbs are skeletal, and his eyes are completely hidden by deep shadows, revealing only his bright blue pupils. The two strands of his hair fall listlessly to the sides of his face.

All Might's (Toshinori Yagi) personality is defined by his unwavering optimism, overwhelming charisma, and profound sense of duty. As the "Symbol of Peace" in My Hero Academia, his character combines a brilliant public facade with a humble and vulnerable private reality.
Its most prominent features are:
Pure altruism: His philosophy is based on saving people with a smile, conveying security and dispelling the fear of the victims. He is willing to sacrifice his own life and well-being for others.
The smile as a shield: He maintains a constant smile not only to reassure the public, but as a psychological tool to deceive his own fear and pressure.
Paternal and dedicated mentor: Upon bequeathing One For All to Izuku Midoriya (Deku), he becomes a paternal, patient, and extremely protective figure, celebrating his pupil's growth above his own.
Duality and vulnerability: Outside of his muscular physique, he is a gaunt, reflective man, aware of his physical limitations. Despite his chronic pain, he maintains an iron will and great humility, far removed from the arrogance that his fame could breed.