So something thatâs been bothering me since we first found out about it: why did Stain attack Tensei?
It was a catalyst for Tenya and effects of it still linger in the story, so it was a pretty important point, but why did it happen? We know that Stain only kills âbadâ heroes who are in it for the money or some other petty reason, which is why he spared Izuku but went after Tenya. But from what weâve seen of him Tensei was a pretty good hero and an all around good guy and brother. Not really the type Stain targets. And sure he has that one-off line about popularity being part of it, but he also clearly wants to help people.
A possibility is that Stain tests heroes in some way, to see what theyâre made of, and Tensei failed, or maybe he just operates under the idea that all heroes are corrupt unless they prove otherwise; guilty until proven innocent. The latter seems more likely. But chapter 203 hinted at the character of Tensei, with Tenya talking about how heâs representing Ingeniumâs good name, which we all know is the hero name he inherited from his older brother.
But that just brings me back to my first point, that Tensei seems like a decent guy, not the type to hide and commit morally questionable actions, certainly not as a hero. From what weâve seen of him, he expresses good character.
And then I remember that at this point in the manga (I havenât read Vigilantes or seen the anime) we have only seen Tensei in two perspectives: his injured state after the fight with Stain and, for the majority of his appearances, in the memories and flashbacks of Tenya, his adoring little brother. In other words, a partial witness.
We donât know Tenseiâs character outside of how Tenya sees him (again, havenât seen the anime or read Vigilantes), which could mean heâs a very different person outside of his appearances.
This is all purely speculation, but twists about characterâs identities, actions and morals are something of a theme in this series, so my question is: What did Tensei do to attract Stainâs attention?
So going through some old likes and saw this one, and had some Ideas.
So the Iidas have canonically been heroes for several generations. The "ingenium" name has been passed down to several people. And we know that they've done well by this. The Iida family have benefited tremendously by being heroes, in terms of fame and fortune and prestige.
So I think that Tensei got picked by Stain because of this. Stain wanted to see what sort of person Tensei was. And I think that Tensei being a decent person saved his life. If Tensei had been an asshole, or a rich kid playing around, Stain would have probably just killed him and been done with it. But we see in canon (mha and vigilantes) that Tensei is serious about heroism, and he's a pretty good guy. And imo, Stain saw enough of this to not kill Tensei, instead basically "killing" his hero career by giving him a crippling blow.

















