Genshin Impact is still in the midst of its Version 2.7 update, bringing in new characters like Kuki Shinobu and brand new events. However, some were still getting leaks into Version 3.0 and beyond, and the latest leak revealed a new character. Su is closely related to a HoYoverses sister game, Honkai Impact 3rd.
On June 21, prominent Genshin Impact leaker Ubatcha posted a partial image of Sus early character art. Ubatcha stated that the characters name will not be Su in Genshin Impact, despite sharing a similar design. This character will most likely not be playedable in Version 3.0. (He may however be introduced.)
Ubatcha revealed the full image on social media, revealing a completely different version of the new Su-like character. However, the blurry image is difficult to see in great detail, but players will be able to select the most prominent aspects in this image. His chest is a glowing green vision, likely a Dendro vision.
Data miners from Genshin Impact @SaveYourPrimos later confirmed that the image depicting the Su Expy is real. This image was not reshared due to the events surrounding the leak. This does likely mean this Su character will not be played in Version 3.0.
This is not the first time Genshin Impact has taken inspiration from Honkai Impact 3rd for its character designs. Yae Miko was inspired by Yae Sakura, and Raiden Shogun closely matches Raiden Mei from Genshin Impact. The naming guidelines do indicate that Sus will not be too far off from his Honkai Impact counterpart, although it is very important to wait until the official confirmation is confirmed.
Note: Take any leak with a grain of salt before being able to finish it. As Genshin Impact Version 3.0 is still a way off, it is important to establish your expectations fairly.