Oda Nobunaga

Oda Nobunaga was a warlord of JAPAN and the head of the Oda House.

Nobunaga in Kichikuou Rance
Nobunaga is a powerful leader in JAPAN. He possesses one of the pieces of the sealed Dark Lord Xavier, which turns him into a Dark Lord. He unified JAPAN under his rule sometime during LP0004. He is the father of Princess Kou. (Note: The Kichikuou Nobunaga is non-canon and has been separated into two characters, Xavier and the father of the current Nobunaga, in the main timeline.)

Nobunaga in the canon Rance timeline
Inheriting the name Oda Nobunaga from his father, Oda Kazusanosuke is one of the warlords of JAPAN, taking the mantle of the Oda House after his father died in the Great Youkai War.

His wife Kichou (帰蝶) died early, leaving him no heir. And after he found out he had an incurable disease, his younger sister Princess Kou became the focus of his life. He wants to ensure a future full of happiness for Kou, wishing her to live a peaceful life safe from quarrels and conflicts, and became disinterested in wars or politics. This caused the influence and power of his house to decline significantly compared to his father's time.

In LP0005 he met Rance and the two became instant friends as they are both very easy-going, and quickly entrusted Rance with running the Oda House. Later, one of the seals of Dark Lord Xavier was broken by his monkey, and Nobunaga became possessed by Xavier. Despite being possessed, his will still resisted Xavier from within. During the Honnou Temple Incident when Xavier was weakend by Rance and Kentarou, Nobunaga managed to partially reclaim control over his body, trying to wound himself further so that Rance could kill Xavier. However, Xavier ultimately escaped in his body, and his soul died in the process.

Xavier, along with Nobunaga's body, was finally destroyed at the Battle of Tenman Bridge.

Trivia
The famous Oda Nobunaga in Japanese history is known for his cruelty. That might be the inspiration of making the Nobunaga in Kichikuou Rance a Dark Lord.

The monkey on his shoulder, Toukichirou, is a parody of Toyotomi Hideyoshi whose nickname is Monkey (based on the Novel "Taiko" by Eiji Yoshikawa) because of his bad looking face. Toyotomi Hideyoshi was a follower of Oda Nobunaga who rose to power after Nobunaga's death. In Sengoku Rance, there are two monkeys that were on Nobunaga's shoulder and their names Toukichirou (藤吉郎), Hiyoshimaru (日吉丸) also were Hideyoshi's names (Kinoshita Toukichirou was the name before he lived as Hashiba Hideyoshi, and Hiyoshimaru was his childhood name).

Nobunaga's wife, Kichou, inspired from the historical figure with the same name, was said to resemble the female Rance too much, both in Rance's Nightmare as well as the Joke Ending.