But like...he's still the same Shaco, just not human. I know you said you dislike Jhin because he stole mr jesters shtick but honestly I think Jhin pulls it off soooooo much better at the moment, he just has a certain charisma to him and he gets that through being human(being extreme and all that jazz).
The thing is that Shaco was one of the most poorly written characters since he came out. His thematics were interesting and lore gave some fine ideas but he wasn't fleshen out. No motives, no backstory, no origins, almost no insights to his work he was all mysterious doing things for reasons and because of reasons. When the retcon and lore updates were announced I was patiently waiting few years for Shaco to get a proper lore. His thematics and ideas around him made me think (and a lot of other people too) that he will be Joker alike terrorist with terrible work. Then in 2016 Jhin came and his release hit me like a bag of bricks. He received everything that I or other Shaco enthusiasts expected Shaco would get. My dislike for Jhin is a matter of my own personal disappointment.
I never really thought of Shaco as being human and with the new Demacia lore update, it shows that demons can still be a terror and have to evade the law in places without necessarily being bound by normal world matters. I think rito can pull off a charismatic demon jester and if anything I have faith because Jhin is so damn satisfying.
No one before did either because Shaco was mysterious and all. You could think anything of him and that could be true.
Demons are terror indeed as Aaatrox or Tahm's lore show but the point is that it's meh. They are so powerful that wordly matters do not encompass them and the only thing about them what can be interesting is what they do. Jhin besides that what is he doing has several character traits that give him more depth like previously mentioned extremum of human behaviour and disfunctions, limitations of it and what thrill it gives (you know, Jhin can be imprisoned, executed, broken and stuff).
Also his clones and boxes were never mechanical since everything except the shiv always appeared with a poof. That being said instead of a Joker angle I think rito can go with a more funny-man kind of vibe with Shacmeister because he is doing all of this because he legitimately thinks it's funny (unlike mr four who wants to make you art, mr two wants you to dance around his boxes and laugh as you die attacking a ticking time bomb that you think is him - I find it hilarious to JitB, hallucinate send clone out, let them follow him to the JitB, decieve, let cloney explode and backstab shiv them.)
Many people thought of him as having some mechanical traits because of skins like Workshop or Nutcracko. Asylum skin also shows that he is indeed human (or at least human alike). Poof could have magical traits because as we know technology in League of Legends universe is powered by magic anyway (Hextech and maybe Chemtech i'm not so sure about the latter). His updated splash art gives impression of metalic mask (think of Dishonored protagonist's mask).
I like your further point of view. That would make incredible and interesting insights to his doings and it would finally match his lore with gameplay.
Honestly think there's room in runeterra for several joker like beings whether it's mr two or mr four I'm still gonna enjoy spamming mastery rank when I ult snipe or ult dodge someone elses ult.
No doubt about it but it just feels unfair that new champion got an honor to be superior in those similar thematics even though there was and still is older champion hopelessly waiting for it for years.
Demons as a concept are boring in this game. In other games they are background for certain individuals to emerge from, give them context for interesting things. Notable example is Fall from Grace from Planescape: Torment. Nothing interesting in her being Tanar'ri but it gave her context. She is struggling with her demon heritage, this is not what she truly is, she acts against her nature. She isn't doing things because she is a demon of X. She is doing things despite being it. In League of Legends the only context demons give is why they do certain things in a lazy manner. In lores being purely about characters it sucks. Tahm or Aatrox represent that what should be a background for other characters. We have too much general stuff like that in other universes like Diablo, Warcraft and many, many others. It got boring after all these years.