Zhongli is interesting to me because he’s very much an outlier among the other Archons.
All the Archons have some sort of “twin” except Zhongli. Ei and Makoto, Venti and the Nameless Bard, Nahida and Rukkadevata, and Furina and Focalors. One could argue Guizhong is his “twin” but I heavily disagree because the Archon “twin” is directly related to the identity of the Archon. Ei and Makoto were twins, Nahida was a new iteration of Rukkadevata, Focalors and Furina are the divine and the human sides of the same person, and Venti directly took on the identity of the Bard. Adding on, the “twin” usually dies. All this implies two possibilities. Zhongli either never had a “twin” or his “twin” was already rendered deceased long ago. Either way both of these imply he’s different from the others on a level we don’t know.
Next: his draconic motifs. His Exuvia form was a dragon (some translations I’ve seen Half-Dragon, Half-Qilin) and his character design is very heavily based in this draconic identity. Further still, no other Archon so far has this motif. They are associated WITH dragons sure, Venti and Dvalin, Nahida and Apep, Furina and Neuvillette, but no other Archon is depicted with both divine and draconic motifs. There’s theories about Zhongli being or related to the Geo Dragon Sovereign for a reason. In his ascension voicelines he comments on his power growing stronger which isn’t unusual that’s the point of them but the giving up of his Gnosis makes his odd because it almost seems like the removal of the Gnosis was suppressing an aspect of his power, possibly a draconic power. Even when his divine identity was mostly shed his draconic aspects remain.
Finally, the cubes. All the other Archons in their statues have a circle motif. Venti and Rukkadevata/Nahida old some sort of orb, Makoto/Ei has her circle behind her and Focalors/Furina holds a sword with circular designs. Zhongli, however, holds a cube. Not just any cube either, a cube that is reminiscent of the Heavenly Principles who kidnap the Traveler’s Sibling at the start of the game. Add to this Zhongli weird connections to Celestia/The Heavenly Principles, his weird motif with the sun and the whole sun chariot lore, his Archaic nature and unknown origins, it’s extremely odd.
Zhongli is one of my favorites because he definitely knows more than he’s able to tell and he’s so different in the pattern of the Archons. Anyways feel free to give thoughts, have a great day, mwah!