Merging the tags would be problematic because most of their existing posts were created by only one artist. I would say treat it like a circle. Make an artist entry for kito koruta with the shared URLs and then set the group name for each artist to kito koruta. Then tag posts with kito koruta if they were made by the circle and with the individual artist if they were made by only one artist.

The bulk update request #2417 (forum #164668) has been approved by @evazion.

The bulk update request #2423 is active.

create alias painteen -> zerocat
create alias pupupu_(1053378452) -> meion
create alias mullpull -> haruri
create alias kyou_(user_gpks5753) -> kyou_(fr39)

Reason: Artist's current name.
As for the last one, using his Twitter handle as qualifier, which I think is way better than stacc name.

EDIT: The bulk update request #2423 (forum #164738) has been approved by @evazion.

The bulk update request #2424 is active.

create alias igakusei -> igayan

Reason: They changed their name to igayan a couple years ago.

EDIT: The bulk update request #2424 (forum #164739) has been approved by @evazion.

evazion said:

Merging the tags would be problematic because most of their existing posts were created by only one artist. I would say treat it like a circle. Make an artist entry for kito koruta with the shared URLs and then set the group name for each artist to kito koruta. Then tag posts with kito koruta if they were made by the circle and with the individual artist if they were made by only one artist.

The only problem is that they are already in the same circle with a different name (おうち大好きインドア派, Ouchi Daisuki Indoor Ha).

Let me know if these look okay:
artist #114595
artist #117683
artist #201369

The bulk update request #2429 is active.

mass update qin -> artist:mahou_kyuuri

Reason: Artist's old name -> new name

This is a mass update instead of an alias because qin is becoming ambiguous through an increase in the number of Chinese characters and artists named Qin_* or Qing_*.

EDIT: The bulk update request #2429 (forum #164780) has been approved by @evazion.

The bulk update request #2431 is active.

mass update choseon -> artist:chowbie

Reason: Artist name on Twitter, Pixiv.
Signs art with chowbie.

EDIT: The bulk update request #2431 (forum #164791) has been approved by @evazion.

The bulk update request #2432 is active.

create alias rin2010 -> noriuma

Reason: Same artist.

EDIT: The bulk update request #2432 (forum #164792) has been approved by @evazion.

The bulk update request #2432 (forum #164792) has been approved by @evazion.

The bulk update request #2431 (forum #164791) has been approved by @evazion.

The bulk update request #2429 (forum #164780) has been approved by @evazion.

Arcana55 said:

The only problem is that they are already in the same circle with a different name (おうち大好きインドア派, Ouchi Daisuki Indoor Ha).

Let me know if these look okay:
artist #114595
artist #117683
artist #201369

This looks fine.

The bulk update request #2424 (forum #164739) has been approved by @evazion.

The bulk update request #2423 (forum #164738) has been approved by @evazion.

The bulk update request #2441 is active.

create alias 735308747 -> nai_(daiduolaoge)

Reason: Artist tag is rendered as a generic string of numbers, the stacc name (which is near unusable in tag searches; why anyone would think they're "viable" choices for artist names, I do not know).

Their current name is ない (translated as "nai"); the qualifier is their Twitter name (怠惰老鸽) translated from Chinese.

EDIT: The bulk update request #2441 (forum #164865) has been approved by @evazion.

The bulk update request #2443 is active.

create alias everfornever -> ursica
create alias y3010607 -> arata_(xin)

Reason: The name was never correct in the first place (using stacc name instead of actual name).
For the second one, his actual name instead of Twitter handle (xin comes from his Facebook page, and has same meaning as arata).

EDIT: The bulk update request #2443 (forum #164892) has been approved by @evazion.

The bulk update request #2447 is active.

mass update kisakibu -> artist:isomu

Reason: Name artist goes by now, signs art with this name

EDIT: The bulk update request #2447 (forum #164941) has been approved by @evazion.

The bulk update request #2441 (forum #164865) has been approved by @evazion.

The bulk update request #2443 (forum #164892) has been approved by @evazion.

The bulk update request #2447 (forum #164941) has been approved by @evazion.