Either Rhein or Kasperle.

Kaveh: "Oh? I never thought there'd be someone who'd love me THIS much.
I'll accept your proposal! Dehya is definitely coming along too. I'll see if I can get the wedding planned as soon as possible!"

Faust: "I would ask him as to why he is even there in the first place. In attempts to restrain myself from murdering him as he stands."

Dinawari: "Most stupid thing? I wouldn't exactly refer to it as 'stupid', yet there was this one time where he was unable to find his glasses.
He asked me, and later Kaveh. Turns out his glasses were on his head the entire time. I suppose that his sleep deprivation got to him..."

Honestly, Eliás could. Then he'd take it apart.

I actually don't know where to start, but I could go into more detail on my sona, Izhoth'dhra himself. He's very silly.

By silly, I mean he's horrifying. An elder god who is capable of flooding the world and creating it anew as a blank slate. He has his own worshippers, and a fancy title for himself. "The Rapture of the Deep" (another name for nitrogen narcosis).
Instead of wreaking havoc, he just stays under the sea because he's not about that kind of life. Just vibes.

I've got a few!

Organizing them by region:
Mondstadt - Rhein (Hydro)
Liyue - Xuĕ (Cryo), Jiang (Dendro)
Inazuma - "Beltrame"/Yōko (Electro Delusion, Pyro Vision)
Sumeru - Nadine (Hydro)
Snezhnaya - "Mezzetino"/Wei Yang (Geo Delusion, Pyro Vision)
Fontaine - Eliás (Geo)

Fun fact, only Nadine is the OC in this list who isn't shipped with a canon character.