"Nidhogg is a character in the Japanese manga ""Truthfully, They Only Remembered Her"". He is a powerful dragon-like creature with black scales and glowing red eyes. Nidhogg is a fearsome creature who is known to be a very powerful adversary.

The character of Nidhogg is introduced early on in the manga, and quickly establishes himself as a major player in the story. His presence is often felt even when he is not on the page, with characters often discussing him and his actions.

Nidhogg is a complex character with a very interesting backstory. He was once a powerful and respected dragon who ruled over a vast kingdom. However, his thirst for power and his desire to dominate all around him eventually led to his downfall. Nidhogg was defeated in a great battle and was forced to flee into exile, where he has remained ever since.

Despite his fearsome reputation, Nidhogg is not without his redeeming qualities. He is a fiercely loyal creature who places great value on friendship and camaraderie. He is also very intelligent, with a keen mind for strategy and tactics. Nidhogg is always looking for ways to improve his situation, and is never content to simply stay still.

Of course, Nidhogg is not without his flaws either. He can be very stubborn and set in his ways, and he often has a difficult time trusting others. This can make forming alliances and working together with others a challenge. Additionally, Nidhogg can be very ruthless when he feels that his interests are threatened, and has been known to be quite brutal in his methods.

Overall, Nidhogg is a fascinating character, with a complex personality and a rich backstory. He is definitely one of the standout characters in ""Truthfully, They Only Remembered Her"", and his presence is sure to be felt throughout the rest of the story."