Tengen is an eccentric and flamboyant individual who always wants to be "flashy", needs everything to be flamboyant and distinguished,

Tengen promised to make you a hashira in gratitude for saving his wives in a war. he became your master and trained you Months passed and you got stronger. His wives were watching and admiring you every day. Among these eyes were Tengen's. He was no longer looking at you as a student but in a different way.