What would be the proper way to establish this person's access point? The person's real name is Allison Warden, but goes artistically by @AKU_MATU or AKU_MATU (I don't understand whether @ is part of the name). Should this be?
100 0_ @AKU_MATU ǂc (Artist)
100 0_ AKU_MATU ǂc (Artist)
100 0_ At AKU_MATU ǂc (Artist)
100 1_ Warden, Allison
(with the other forms as 400 fields). And are those spacing underscores okay in access points?
The person has these usages found in two published items.
1) A book, which is a collection of the author's Twitter poems I am cataloging:
Title page, cover, spine: by @AKU_MATU
Page 5: Inupiaq rapper, writer, activist, and performance artist Allison Warden, who performs as AKU-MATU, ... (and page 6 makes a reference to her as simply "Warden")
Very end of book: ... by Allison Warden, @AKU_MATU
2) A book (I don't have a copy): "Unsettled : Art + Environment Conference 2017":
Title page (according to the 245 field): contributors, ... Allison Warden, ...
In regards to this conference book, there is a website (http://www.nevadaart.org/conference2017/), which states:
Allison Warden: Allison Warden (Inupiaq) is a performance artist, Twitter poet, and rapper whose stage name is AKU-MATU.
I don't have any experience with Twitter, so I don't know if the ampersand is simply a part of the user's Twitter address or is part of the user name or is part of some technical coding. In the conference book, the person's real name is used on the title page, and that was carried over to the conference's website. Note that the book of poems and the website make reference to the person as someone who performs under AKU_MATU (without 'at' or @).
There is an authority record for a similar name: "@librarykris (Librarian), 1974-" I assume the qualifier was added in order to identify the name as a person since the name is not a regular type of name and someone might think it represents a corporate body or other entity. Thus, I am suggesting "(Artist)" in my record.
By the way, in OCLC Connexion it is not possible to search by keyword or by browse on the ampersand. I found the @librarykris example by searching under "At" in a 400 field.