Tengan Uzui's Father

The father of Tengan Uzui is a flashback antagonist of Kimetsu no Yaiba. He was first introduced in the flashback of Tengan Uzui, the Sound Pillar, when the latter revealed his ninja heritage and his disturbing past.

Overview
The unnamed ninja of Uzui clan is the father of Tengan Uzui and eight other unnamed siblings, and is a sociopathic and abusive ninja clan leader who sees his clan's survival over his family. Horrified by the loss of his clan, Tengan's father eagered for his clan's survival. To achieve such, he began to train his children to the level of torturouse and even abusive.

When Tengan was 15 years old, seven of his siblings died out of exhaution, while Tengan and one younger brother of his, two years younger than him, survived the trainning. However, Tengan discovered that due to such trainning, his brother became just another copy of his father, cold, cruel, uncaring and vacant of humanity.

Above all it was also implied that Tengan's father only saw his wife as a baby factory giving birth for his heirs and never cared about her life, and he also disrespect other people's will. After discovering his father's lack of humanity and his brother's sociopathic tendency leaning towards him, Tengan decided to disregard them as his family.

It currently remained unknown what became of Tengan's father after Tengan found his new purpose in life after joining the Demon Slayer Team.

Trivia

 * Many fans had speculated that the sociopathic attitude of Tengan's father would drove either him or Tengan's brother to renounce humanity, eventually becoming a replacement of Gyokko - a new Upper Moon Five.