Nobunaga was a famous politician and military strategist in Japanese history. He led Japan during the Warring States Period in the early 20th century and became one of the most outstanding figures in Japanese history.
Nobunaga was born in 1562 and was a subordinate of Hideyoshi. In 1585, he joined Hideyoshi's army and became one of Hideyoshi's important advisors in the following years. After Hideyoshi unified Japan, Nobunaga became the successor of Hideyoshi and led the unification of Japan.
After unifying Japan, Nobunaga began to implement his political and military strategies. He adopted the enfeoffment system and divided Japan into many territories and established a strong central system. He also vigorously developed agriculture and industry to improve Japan's economic level.
However, Nobunaga's political and military strategy also faced many challenges. His power and influence continued to expand, causing dissatisfaction among other forces. In 1603, Nobunaga was forced to flee Kyoto after a rebellion in his territory. After that, he wandered around until 1615 when he returned to Kyoto and launched the famous "Tiger of Kai" battle to defeat the army of Mitsuhide.
In 1616, Nobunaga became the first emperor in Japanese history and established a new government. He carried out a series of reforms, including the abolition of the feudal system, the implementation of a central system, and the improvement of civil rights.
Nobunaga was a complex and challenging character. He was an outstanding politician and military strategist who had made great contributions to the unification and modernisation of Japan.
I don't think so. There haven't been any official announcements or indications that the HxH manga will continue. But you never know, maybe there'll be a surprise in the future.