Perhaps the most reluctant of the bronze saints, Shun is the official Bronze Saint of the Andromeda constellation. He is a merciful soul by nature, and a firm believer in solving problems without causing bloodshed. This creates a sharp contrast between himself and the rest of the Saints: Whereas they will not hesitate to battle when the situation demands it, Shun only allows himself to fight if it's an absolute necessity, or when his almost endless patience wears off. When any of these things happen, Shun becomes an extremely vicious fighter.

Shun comes off rather badly in the Movies and 'Asgard' arc. In almost every fight scene, he almost always loses, and needs his brother Ikki to rescue him (except against Mizar Zeta Syd, the one time Shun defeated a foe in either the Movies or 'Asgard' story).

However, in the 'Sanctuary', 'Poseidon' and 'Hades' storylines, Shun comes off as a good, if reluctant fighter. In 'Sanctuary', he manages to hold his own against Gemini Saga, and even manages to kill Pisces Aphrodite, both of them Gold Saints. In 'Poseidon', he acquits himself nicely, defeating Io, the Southern Pacific Mariner General of Scylla, and Sorrento, the Southern Atlantic Mariner General of Siren. In 'Hades', he manages to dispatch various opponents. As a result, he comes off looking much better in these arcs than in the Movies or 'Asgard'; though he may be reluctant to fight, he will when he has to, and is just as powerful or skilled as any of the other main Bronze Saints (Shiryu, Hyoga, etc.)

(Source: Wikipedia)