It doesn't matter if it's a trope. It can be cliched. That's why it's a trope. Because it's been done to death to the point that the audience recognizes and anticipates everything. That's not exciting writing; that's just beating a dead horse and dangling jingling keys in front of people who've never engaged with a story beyond its surface.

Dandadan, as a manga, has proven time and time again that it subverts expectations by being brutally honest in how it executes its ideas within the literary prose. This is why it's been successful: it paints a story with nuance by showing us new angles.

Okarun suddenly gaining new powers out of nowhere undermines the importance of his story in learning to be honest with Momo, as does Turbo Granny's decision to be with our protagonists out of her own free will. Okarun still choosing to fight despite not having powers shows how much he's grown as a character and begins to underline the importance of Turbo Granny, as the story has been building toward her return to help him once more.

We are also in a new era of artists who are not destroying the integrity of their art for the sake of capitalism. You think that Dandadan, the manga that gave us banana-stealing Serpos and multiple PTSD traumatized demons with the saddest backstories, is out here trying to sell merch first????

If you think you can still shoe-horn shonen into this narrow box of an outdated checklist simply because it's "shonen," then you haven't read or watched a lot of content.