Yakumo was more reserved and practical than Takaharu. While Takaharu frequently acted on emotion, Yakumo tended to think things through more carefully.

He also had an international background, having spent time studying abroad.

That gave him a slightly different perspective from the other members of the Igasaki family.

His seriousness frequently made him the straight man when Takaharu and the others became too chaotic.

The contrast between Yakumo and Takaharu helped create one of Ninninger’s central team dynamics: enthusiasm and instinct working alongside discipline and reason.