Kurogane is serious and extremely perceptive, being able to quickly discern Syaoran's fighting ability (along with Syaoran's blind right eye) as well as Fai D. Flourite's true nature and fighting capabilities. While he seems rather irreverent, he is also very loyal. He is likely the most experienced fighter in the group and wiser than he appears. He becomes Syaoran's sword fighting teacher, presenting the boy with the same philosophy he believes in: a sword is used to cut only when needed and not used to cut anything if it is not necessary. While serious, Kurogane is very easily irked by others, especially by Mokona Modoki and Fai, who keep calling him ridiculously cutesy nicknames such as "Kuro-puu", "Kuro-wan-wan" or "Kuro-rin". However abrasive and ruthless Kurogane may seem, he has a compassionate nature and a desire to protect. An example of this would be how Kurogane continually questions Fai on his actions and character, and lets the wizard know that he should stop hanging onto his past and embrace the future with his new companions. Or, Kurogane's own statement that "If someone wants to take away the ones I want to protect, I'll kill them too".
His compassion and protective nature is especially clear when his actions early in the series are compared to his actions later on. He had straight out told Syaoran in their first world, the Hanshin Republic, that the quest has nothing at all to do with him. In the next world they visit (Koryo Country) however, Kurogane offers his services to help raid the castle of an evil lord, and stays behind in battle to let Syaoran go on ahead. Eventually, he risks a loss in strength to avenge his comrades' "death" (they were of course still alive) by defeating their killer in battle. It is noted that after he finds out Fai and Syaoran are still alive, he lost his passion for the battle.
He obtained a new sword in Outo called the Souhi (Blue Ice or Pale Ice) and taught Syaoran the skills of sword fighting and sensing attacks from the left.