In Kamar-Taj, holding the Dark Book, he's a legitimate wizard. Having awakened the Eye of Truth and the Immaculate Body, he can quickly master any magic to incredible levels, without fear of backlash. Although he studies dark magic, Jiang Yu claims he's truly a legitimate wizard! He only sleepwalks occasionally, and hasn't done anything bad. What dark magic? It's legitimate magic. Jiang Yu: I'm a respectful wizard, kind and friendly, a gentleman with no desire for power. Ancient One: Does your respect for teachers mean you insisted on learning even though I told you not to? Strange: You're indeed very friendly to me. Aside from the fact that you manipulated me with magic, even swindled the Eye of Agamotto from me, and your reckless sleepwalking caused me trouble, you're indeed very kind. Wanda: So the latest gentlemanly mage behavior is aggressive advancement? And he's also flirting with other women, offering them sleep aids? Thanos: The Infinity Stones were mine, mine! Don't you have no desire for power? Why are you trying to snatch the Infinity Stones from me?

When Gekko Shigure came to the Naruto world, he seemed very mediocre in the first twelve years.

His talent, physique, and everything else were average, except that he was handsome.

He thought he would live a mediocre life in the Naruto world, but the skill bar that suddenly appeared made Shigure a genius from then on. Any ninjutsu could be put into the skill bar, without control or operation, and it would run automatically.

Naruto: "Why did you use the ninjutsu you just learned yesterday so well today? Is there any secret?"

Sasuke: "You are the real genius, you were just playing me before!"

Kakashi: "There are geniuses every year, but this year is particularly fierce. As a teacher, I am under a lot of pressure. I want to retire, Sandai!"

Sandai: "You want to retire? I still want to retire! That kid is simply not a human. I am a remnant of the old era. There is no village where I can stay in the new era!"