|Aliases|| Colonel Nidhogg|
|Physical and Vital Information|
|Hair Color||Dark gray, gray|
|Occupation|| Leader of the Northern army|
Prime Minister of Lilith Kingdom
|Affiliation|| Lilith Kingdom|
|Game||3-3 Prime Minister's Secretary|
While generally strict and professional, he seems to have a soft spot for his timid secretary, Yvette, who he keeps around despite her poor track record in fashion battles.
|“||The mark left by where a person was born is permanent. When Lilith's look of Prime Minister has become symbolic of Nidhogg, even after putting on the northern military uniform, his charm still goes with it so naturally, one cannot help to praise and admire - the real Nidhogg. He is mesmerising like the dark night, he is sharp as the cutting edge of a blade.
The smile of Nidhogg, is it buried together with the memories of Lilith's departure?
— Nidhogg's description in the Time Diary
Nidhogg is a tall man who wears dark, formal clothing most of the time. He has dark hair with a streak of silver in his bangs.
Nidhogg has a cool, calculating exterior, rarely cracking jokes. However, it is said he holds a soft spot for teasing his secretary Yvette.
Underneath his polite and coold facade, however, there's a deeply wounded and extremely ruthless man. His harsh experiences as an orphan from the gelid and war-like North Kingdom have convinced him that Miraland is a deeply flawed place and that he must change it at all costs. As such, he is willing to betray the trust of the Lilith Royal Family and plunge the continent into an all-out war so he will be able to defy the "fake peace" coming from the Blood Curse, which harms anyone who uses force on others.
Nidhogg was born in North Kingdom, and became an orphan at some point. He later gained power by appearing at the Designer's Tea Party and designing the Rose Dress, and became Prime Minister of Lilith.
Nidhogg first appears here to watch the play, reprimanding Yvette for wasting time competing with Nikki and not even winning. After the events of the chapter go down, he is seen evacuating with Yvette.
Nidhogg and Yvette are at the Rose Garden in Wintermount, Lilith. It is revealed that this is where he made his debut at the Designer's Tea Party, and that the Rose Garden was built in honor of his accomplishments.
Nikki and her friends properly meet Nidhogg for the first time while on a cruise ship on the Celestial Lake in Cloud Empire. Nidhogg shows curiosity in Nikki as a stylist after hearing that she beat Yvette. He also reveals that Kimi told him that she chose Cloud Empire to train herself as a stylist.
Nidhogg mentions that Nikki may run into a gentleman-like soldier from Apple Federation in Moonlit City. Yvette cheerfully praises Orlando, but Nidhogg interrupts and has Yvette duel Nikki. In Chapter 8, this soldier is revealed to be Orlando, a friend of Kimi who was working with Nidhogg to investigate the apparent damage of the Iron Rose on Moonlit City.
Nidhogg is seen preparing for the Styling Contest with Yvette at the beginning of the chapter. Yvette asks him if it is okay for them to schedule a guard deployment meeting for tomorrow, and Nidhogg says he will handle it himself.
After Nikki prepares for the Styling Contest, she learns that Nidhogg and Royce believe that this year is different: someone will try to cause trouble.
Nidhogg oversees the finals of the contest. After Nikki and Sherry finish the first match, Nidhogg tells Royce there is an intruder in the outside garden of Queen Nanari's palace. Royce is concerned over his sister's safety and leaves immediately, leaving Nidhogg in charge.
After the second match, the people in the front row draw swords, causing panic in the audience. Nikki realizes that Nidhogg has disappeared, and she and her friends escape the styling contest.
Royce reveals that Nidhogg has betrayed Lilith, and that he has always desired power. He adds that he had some suspicions about Nidhogg's grim intentions before the Styling Contest, but did not want him to find out.
Royce manages to take control of the city using the Lilith Army, but he says that Nidhogg is behind the rebellion that has taken place. Nidhogg loses his position as Prime Minister, and is suspected to have returned to North Kingdom where he grew up.
While Nikki and her friends are in the Republic Wasteland, Nidhogg leads an army from North to a very important location: Cloud City. Amphithea News discovers and reports on this. Nikki, who is in her way to retrieve a powerful scroll to help Lilith Kingdom, changes her mind and decides to see if she can help Lunar.
Nidhogg engages in a duel to the death with Lunar, who is defending Cloud City, and fatally wounds her just as Nikki and her friends arrive, suffering the Blood Curse that affects all citizens of Miraland. As he pays respects to the late Lunar, Bobo asks him why he decided to start the war, but he refuses to answer.
When the group try to convince Nikki to fight him, Nidhogg says that the peace brought about by the blood curse is a false peace. Bobo gets angry at him, telling him that he benefits from the false peace too, because of his victory at Wintermount at the Designer's Tea Party all those years ago. Nidhogg gives Nikki the chance to compete with him.
Nidhogg shows off the skill Dark Verdict in the battle, which reduces Nikki's score to only 10,000 points. Only after attempting to fight him over and over does the Iron Rose bring the Dawnblade, which impresses even Nidhogg. With this tool, he finally loses to Nikki, and removes his soldiers from Cloud City.
Ozeca, an officer from the League Till Army, asks Nidhogg why he let Nikki and her friends go. He says it's his own business. She offers him the No. 7 Reagent, which can reduce his pain from the blood curse, but he declines it because he wants to be aware of the suffering. Ozeca asks if they should contact "him", but Nidhogg says he will arrange it himself. It is not clear who they are speaking of.
- "If one does not have power he will be eliminated. Remember this and accompany me now to the conference."
— Nidhogg to Yvette in 3-3 Prime Minister's Secretary.
- "War goes hand in hand with pain. Once you start a war, you should be aware of the suffering."
— Nidhogg to Ozeca in 15-Side Story 4 No. 7 Reagent.
- "It's a gift I prepared for you."
— Nidhogg's envelope.
- "Keep going, so that we can meet at the finale."
— Nidhogg's envelope once opened.
In Love Nikki there are descriptions on each clothing and some can give insights into the characters. All of the following items mention Nidhogg.
|Rose Pool||Dress No.106||The unique Rose Pool short shirt on Miraland! Nidhogg's design is incomparable!|
|Little Daisy||Dress No.223||Somehow, even when Yvette is in a daisy dress, Prime Minister still thinks that she is like a little rabbit.|
|Slip Dress-Black||Dress No.525||Nidhogg saw the secretary in this dress, and criticized her seriously, what happens to being a meticulous secretary.|
|Gray Scale||Coat No.84||Born in the cold North Kingdom, Mr. Nidhogg became famous at the Designer's Tea party in Wintermount of Lilith.|
|Blossoming Flowers||Coat No.97||When Yvette just became the secretary of Mr. Nidhogg, she could not even think of passing such strict inspection.|
|Boundless Snow||Coat No.100||Girls in North Kingdom are all waiting for the handsome Mr. Nidhogg to come back from Lilith to serve at home.|
|Emperor's Woman||Coat No.106||It is designed by Mr. Nidhogg. Maybe only girls from the North Kingdom suit this style.|
|Little Secretary||Coat No.107||Yvette is the secretary of Mr. Nidhogg. But compared with other workers in the palace, she looks more like an object.|
|Composite Jacket||Coat No.118||Gossip: Mr. Nidhogg seems cold to everyone and rarely talks, but he loves to tease Yvette very much.|
|Dewdrop||Top No.135||Nidhogg Series -- 999 daily incidents between the scheming prime minister and his gentle, bunny-like secretary.|
|Affection||Top No.138||Yvette wore this top for her first job interview. The prime minister thought he was watching a white bunny.|
|Green Star Soul||Top No.226||The Designers' Tea Party can make an orphan become the prime minister of Lilith Kingdom.|
|Secretary-Clothes||Top No.340||Yvette followed the Prime Minister to visit the Pigeon Kingdom, and she changed into elegant business dress.|
|Secretary-Shorts||Bottom No.319||Along with the Prime Minister, Yvette went to visit the Pigeon Kingdom.|
|Pink Rabbit||Hosiery No.149||Everyone is astonished by this work of the prime minister -- it is not his style!|
|Fresh Roses||Hosiery No.169||An item from a suit by the prime minister of Lilith Kingdom. And no surprise, the theme of this suit is rose.|
|Snow-Feather||Hosiery No.401||Looking back to the south, Nidhogg smiled. With the flame inside, he walked into the northern blizzard.|
|Gentle Dance||Accessory No.959||The little magic staff is designed by Mr. Nidhogg. Many people are surprised at its girlish design.|
|Dawnblade||Accessory No.1624||Iron Rose brought the sword which can fight against Nidhogg's Dark Verdict.|
|Moon Night Lantern||Accessory No.3080||In this night of full moon, Nidhogg who loves rabbits has prepared several gadgets.|