"senfen" and "xngfng95" are both used on e621. While "senfen" has more items, "xngfng95" actually has an artist page.
https://e621.net/artist/show/33055

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Ko-Fi:

Hey~ My nickname is Xiongfeng, a.k.a Xngfng95 or Sёnfёn.

Furaffinity:

Hello~
My full nickname is Xiongfeng or Sёnfёn and I'm drawing some stuff ;з

These should show it is the same person with quite some aliases.

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DeviantArt: xiongfeng95
Furaffinity: xngfng95
SoFurry: xngfng95
ko-fi: xngfng

The artist mostly uses "xngfng95".
The artist seems to be most active on Furaffinity which uses "xngfng95".
The artist crosslinked Furaffinity and Ko-Fi on the respective user pages which both use "xngfng95".

Therefore the main tag on e621 should be "xngfng95" too.

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I understand that "senfen" is easier to type than "sënfën" on most keyboard layouts, so "senfen" shouldn't be invalidated but aliased to "xngfng95".

But the artist page shouldn't list "senfen" under "Other Names" as it is spelt wrong. The artist even uses the diaereses (the two dots above the Es) in the all-caps signature in contrary to the common use to ignore diacritics on capitalised letters.

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Lastly, while editing the artist page of "xngfng95", I discovered that xiongfeng95 is aliased to senfen as of now. Both should be aliased to xngfng95, though.

To make it even more confusing, "xiongfeng95" has an artist page but - as mentioned earlier - "senfen" doesn't.
https://e621.net/artist/show/25985

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Summary:

senfen → xngfng95
sënfën → xngfng95
xngfng → xngfng95
xiongfeng95 → xngfng95
xiongfeng → xngfng95

Remove "xiongfeng95"'s artist page
https://e621.net/artist/show/25985

Keep "xngfng95"'s artist page but merge the commissions field into this one
https://e621.net/artist/show/33055