Reason: While not an easy-to-write name, it's the name he uses everywhere except his stacc name. For the second one, I don't know where "yato" came from, but "pondel" (or "pomdel") is the name he uses everywhere since the beginning. As for the last one, "sakuya" is his current name, with "liao_kj" as his Twitter handle.
Reason: Using artist's name instead of stacc name (with 10011 from his Twitter handle for the first one). For the last mass update, artist's Twitter handle where the name came from was deleted, and he is known as "Subaru" from the beginning. And for the last one, artist's name instead of Twitter handle.
(We are) Kito and Koruta, illustrator duo. Starting Jan 2020, our accounts have been merged.
Koruta's pixiv account now bears the shared name 岐兎こるた (a note indicates 岐兎 should be read as 'Kito', giving KitoKoruta or Kito_Koruta), while Kito's pixiv account says アカウント移行のお知らせ "Notification of account transfer". Both pixiv accounts link to a new Twitter account at https://twitter.com/kito_koruta.
In addition to the shared accounts, both artists still have twitter, nicovideo and pawoo accounts in their own name, at least for now.
How should these artist entries reflect these changes?