He proudly fights for everyone, inside his soul, yagi has the desire to defend the weak, to carry on the people who stands behind him, the hope and the hearth of everyone, he might not have a strong body, yet... but he has a strong soul and he dosen't care on how much he can get wounded, his flesh might get burned, his body shred into pieces, his bones can be broken, but he will never lose not even a fragment of his spirit, that's how yagi approach with life, that's how he thinks he will become strong,
yes, this surely is childish, he watches the world with the eyes of a dreamer, and he might not be the smartest or the strongest man in this world, but pheraps... his strong will will guide him to the right path, and anyway, the world is builded by dreamers.