ChocoCrinkols

Udyr, The Spirit Walker

Sona, Maven of the Strings

Lee Sin, The Blind Monk

This is one of the key figures, Xan Irelia https://universe.leagueoflegends.com/en_US/champion/irelia/

Here if you want to take the time and look it up you can find most of the champions here. https://universe.leagueoflegends.com/en_US/champions/

I think age doesn't matter because according to the wiki, Desir's age when he entered academy is 16 y/o while Adjest is 18-19 y/o

I mean, if you can't stand it, you can just drop it? I'm used to writing a slow-paced novel that is built up slowly. If this not to your taste then I could only apologize, those who have read my previous novels knows that I like taking it at my own pace. I don't want a novel that just go bonk here bonk there rest a little then bonk here and bonk there again, its a repetitive poison for me at least and I don't want that. As for the "Journey Across Worlds" that you're saying, the MC knows how dangerous a shadow world could be that's why he's cautious and won't move without thinking of a solid plan or preparations, I suggest you search for the meaning of the shadow world in the wiki of Returner's magic should be special. There are risks to entering a shadow world and you could only leave that world if you cleared the objective of the shadow world, if you die, there's no such thing as reset and return back to your own world and act like nothing happened.

It depends on your range of novels actually. If you like novels where the MC will have to go the long way to change history then its for you. If you also like a war arc that has 30-50 chapters before it finishes, then its also for you.