The bulk update request #8998 is pending approval.

create alias m.mcallister88 (13) -> mattvalkyrie (7)
create alias m.mcallister (11) -> mattvalkyrie (7)

Reason: Same artist.
(not aliasing to matt_valkyrie because that is a character tag)

m.mcallister with 11 posts.
m.mcallister88 with 16 posts.
mattvalkyrie with seven posts.

Checked the m.mcallister88 posts with sources and they all link to uploads in https://www.furaffinity.net/user/m.mcallister88/ gallery or upload in another gallery that credits FA m.mcallister88 (only exception being a source that has been deleted from FA)

https://www.furaffinity.net/user/m.mcallister88/ link to artist's other acccounts:
A) MattValkyrie username (FIVE accounts)
1) https://furrynetwork.com/mattvalkyrie/ (crashes my tab. Possibly deleted account?)
2) https://ko-fi.com/mattvalkyrie : displays as "MattValkyrie".
3) https://picarto.tv/MattValkyrie : displays as "MattValkyrie".
4) https://www.twitter.com/MattValkyrie : (don't want to look at Twitter)
5) https://www.weasyl.com/~mattvalkyrie : displays as "MattValkyrie".
B) mmcallister88 username (ONE account): https://www.deviantart.com/mmcallister88

And ALL recent art (with name on art) at https://www.furaffinity.net/gallery/m.mcallister88/ has artist name of "MattValkyrie" on art.

First upload in main gallery with "MattValkyrie" on art seems to be https://www.furaffinity.net/view/38237178/ posted 3 years ago ("posted Sep 16, 2020").

Addition notes about tags:

• 9 posts tagged with both m.mcallister88 m.mcallister tags.
• 4 posts tagged with m.mcallister88, but NOT m.mcallister : m.mcallister88 -m.mcallister
• 2 posts tagged with m.mcallister , but NOT m.mcallister88 : m.mcallister -m.mcallister88

Reply for emphasis:

Artist switched to putting artist name of "MattValkyrie" on their art: 3 years (& 11months) ago (starting around 2020 September).