In The Saga of Tanya the Evil, he is the only one who notices the abnormality in Tanya's personality, and he is the most intuition-filled, handsome, bespectacled character in the series, even reporting Tanya's abnormality to the General Staff Headquarters.
We will introduce you to Rerugen.

What kind of person is Rerugen?

His real name is Erich von Rerugen

Source: ©Carlo Zen, published by KADOKAWA / The Saga of Tanya the Evil Production Committee

He is a handsome, bespectacled young officer with the rank of lieutenant colonel, and a staff officer in the Imperial Army. It may have been thanks to Rerugen's support that he assisted in the planning and execution of operational plans and led the Empire to victory.

Source: ©Carlo Zen, KADOKAWA / The Saga of Tanya Production Committee

He saw Tanya at the military academy and intervened when she tried to stab someone who had disobeyed his superior with a bayonet. He sensed Tanya's abnormal personality at the time and is the only person in the Empire who feels a sense of crisis towards her. She also has a large fan base thanks to her cool, intelligent appearance with glasses and her earnest personality.

Did you notice Tanya's paper?

Source: ©Carlo Zen, published by KADOKAWA / The Saga of Tanya Production Committee

Even though I didn't recognize Tanya's paper about the World Wars, there was something very strange about it. The content was that this insane war, in which human lives are converted into numbers, will continue until the nation collapses, and perhaps Tanya's logical words resonated with him.

He reported Tanya's actions during her time at the military academy.

Source: ©Carlo Zen, KADOKAWA / The Saga of Tanya Production Committee

He reported the incident where Tanya attempted to stab him in the head with a bayonet, but Rerugen's advice was wasted, as Tanya was deemed to have matured at the military academy. Tanya was appointed commander of the Aerial Mage Battalion. I understand why those above want to use the talented Tanya, but Rerugen, who is concerned about Tanya's abnormality, may be right. Or maybe not. Since Tanya has since shown remarkable performance, it can be said that for now the decision above was correct.

Source: ©Carlo Zen, Published by KADOKAWA / The Saga of Tanya the Evil Production Committee

"(Growth? Human nature doesn't change that easily!)"

Source: ©Carlo Zen, Published by KADOKAWA / The Saga of Tanya the Evil Production Committee

And then, he finally realized: Tanya was the one who wrote that paper. His sense of unease turned to certainty, but Rerugen couldn't do anything about it. His stomach ached. He tried to advise Zettour about the abnormality of the paper submitted afterward, but was instead told that he was a valuable person who could be trusted with the big picture. It seems that everyone except Rerugen only sees Tanya's excellence and is completely unaware of her humanity.

Going to Meet Tanya in Person

Source: ©Carlo Zen, Published by KADOKAWA / The Saga of Tanya Production Committee

Immediately after returning from his inspection of the regional army, he goes to see Tanya. Even though the job could have been delegated to someone else, the fact that he went to see her suggests that he really wanted to see and talk to Tanya in person.

You should probably study Dacian

Source: ©Carlo Zen, KADOKAWA / The Saga of Tanya the Evil Production Committee

I liked the way he phrased it. I think he meant to say that you should visit Dacia as if you were sightseeing. The Saga of Tanya the Evil is full of unique and stylish expressions.

I'm amazed at Tanya's high level of ability

You heard that from Lord Zettour!

Source: ©Carlo Zen, KADOKAWA / The Saga of Tanya Production Committee

While looking at the map and expressing his opinion on the strategy, Tanya suddenly realizes its true meaning, and Tanya is terrified. It's possible that she was intimidated by Tanya's advanced abilities, or felt that she could use them, but it's clear that this only intensifies her fear.

Summary

Source: ©Carlo Zen, KADOKAWA / The Saga of Tanya the Evil Production Committee

Whether Lerugen or the General Staff's judgment is correct remains unclear, but Lerugen, who points out Tanya's abnormality, seems to be the only sensible person in the Empire.

The higher-ups likely view Tanya as an extremely capable and useful person, so Lerugen may be the only one who can restrain Tanya from within.
I look forward to future developments.

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