What defines a villain?

Ryujiki is Hitoshi's twin brother. He has protected Hitoshi from bullies for years, always getting injured and beaten up in the process. His quirk is silence, and he uses it to keep Hitoshi from voicing his concern. Really, he just wants his brother to be happy.
However, after a particularly bad beating which sends Ryujiki to a hospital, the boy get's kidnapped.
As Hitoshi's mental state declines from the lack of a brother, Ryujiki fights for his life every day in the clutches of the villains. Hitoshi realizes that he always relied on his brother too much, and as he failed to protect his brother when Ryujiki begged for help for the first time in their lives, he considers himself as useless.
Ryujiki on the other hand completely disregards the separation of heroes and villains, and now considers the world to be split in other categories. 'Those who mess with other peoples' lives' and 'Those who don't'.
Heroes, villains, civilians... having a quirk doesn't brand them into a specific category. They can choose to use their quirk to help or hurt others, but they can also choose to use their quirk only for themself. Or to not use it at all!
Why change other peoples' lives unprovoked? If they ask for help, they ask for a positive change to be made. If they don't, why bother messing with them, whether for good or evil?

Once Ryujiki escapes, how will his new view on the world impact his brother?
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The title and cover page may or may not change. Also I am going to go back and edit and re-edit the story.
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None of the fanart is mine. Neither is the title page. All credit goes to the artists.
I do not own any of BNHA or MHA. I only own my OC who's name is Ryujiki.