Somehow, not a single champion acknowledges Shaco's existence.

People always like to joke about Shaco having no lore, and i get that. He probably suffers from the same issue that took them so long to rework Skarner, where Skarner's identity was just "scorpion", Shaco's identity is just "assassin clown", so they struggle to give him a location and lore that fits him well. Hell, a while ago when League Universe had the "Friends and Enemies" section, Shaco was friends with Nocturne and Fiddlesticks exclusively because they had a fear mechanic. But has anyone noticed how not a single champion in League of Legends interacts with Shaco in-game outside of his most recent skins?
So far, his only interactions are with Dark Cosmic Jhin to Dark Star Shaco ("Everybody loves a clown" ), Soul Fighter Viego ("Shaco, my old friend, your betrayal is... predictable") and Samira ("How'd the lifeless puppet get a soul-power. Eugh, creepy clown") to Soul Fighter Shaco; and finally, Winterblessed Diana to Winterblessed Shaco ("You too, Automaton Shaco, will perish by and by").

What surprised me the most is that, even after we got a rework to an existing clown skin (Surprise Party Fiddlesticks), he still had no interactions with Shaco either.

At this point it's hard to even convince anyone that Shaco is even a character and not just a champion. His mere existence breaks the fourth wall in ways that professional writers could only dream of: A champion with no place of origin, no background and no known friends or enemies. I wouldn't even be surprised if a dev told me he just spawned into the game's code and now they can't get him out, forcing them into an eternity of debugging and balancing him without no one's consent. That by itself already sounds like a more interesting place of origin than the placeholder he has right now: A poor vessel to the killer clown archetype and nothing more, nothing less.

Is there any champion that somehow followed this same fate that i am not aware of? Even champions that are a bit lore irrelevant like Gragas still get joked around for being fat or having pre established connections like being Jax's beer buddy.