Shen, Master Yi and Yasuo all seem to be present in the Irelia mural.
Look closely. See the way they wield their weapons.
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Can't see Yasuo or Shen, but I do see a Wuju swordsman. Mind you Yi, though the last, wasn't the only Wuju swordsman. Along with that, it's probably just how most Ionians wield their weapons
But wait, there is more:
https://i.imgur.com/7NQrkUi.png
This is 1000% confirmed, Twitch, Olaf and Viktor helped Noxus in the Ionian Invasion. But they all were defeated by the Ionian cousin of Helmet Bro.
Riven was in it too, you can see her huge ass sword fighting what looks like Yasuo
Well it could also be just other soldiers who use the same techniques. So the guy on the right might be another wuju swordsman,who died in the war. The one that has Yasuos stance might use a similar fighting style to the wind users(or maybe even he uses it without the wind)
I could see Yi being an important swordman in Ionia, but Shen & Yasuo are unlikely. The Kinkou is self governing, i guess they are on friendly therm with Ionia as a whole but they still remain on their side. I can't see them fighting with the others like that. As for Yasuo, poor guy as it rough, he probably just spend his life running away after the disaster of the accusation and never got a chance to fight on the war seeing how he is in disgrace everywhere now.
Yasuo is up left, Yi is the one with the complete closed helmet, and Shen is the one underneath him with the sword being swinged from the back.
Riven can be seen somewhere in the video
next to what appears to be 
there is an unarmed fighter so that could be 
ok cool but where's Zed? Some people are saying that the champions seen aren't necessarily THOSE specific champions-- but rather other characters from their respective clans/schools/whatever-- but the Order Of The Shadow was established way before the Kinkou started fighting Noxus. In fact, the Order was established to fight Noxus during the war BECAUSE Kusho didn't help the war effort. I find it odd that of all the clans left out, the Order is one of them. Unless it's been retconned again. Smh.