Klaudandus said:
i figured their kin_umineko had more to do with posting/retweeting umineko fanart
Artist's Pixiv profile confirms this.
Twitterのアカウントはジャンルによって分けています
"My Twitter accounts are divided according to genre."
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Usually, for potentially ambiguous names, and if I don't want to think too much (or track down multiple artist accounts for an 'ideal' name or fanart "circle" group), I'll just combine the Pixiv display nickname with the staac ID qualifier. So 392_(mnej7252) in this case.