Aj Castelletto
Also known as A.J. Castelletto. Author and illustrator behind Fictions by Aj (@FictionsByAj).
Aj writes the stories and draws the worlds. The catalog spans a children’s picture book, cozy comedy fantasy, a Medusa reimagining, and a cosmic fantasy about becoming yourself.
Fictions by Aj
Aj Castelletto writes cozy, comedy, and fantasy as Fictions by Aj. She is an author and illustrator. Titles are independently published.
The catalog includes Cat & Rat, a children's picture book about belonging; Soft as Dream, Sharp as Magic and Favors, Fangs, & Feral Fluff in The Archive of the Unfound; Rewoven, a Medusa myth reimagining; and The Sycamore: Welcome to Paradox.
Book 2 of The Archive of the Unfound, Favors, Fangs, & Feral Fluff, is Aj-stated for September 22, 2026.
Around the books
The same hands that illustrate Lark also pack the table, sign the copies, and keep the worlds looking like themselves.
Aj with Cat & Rat. 
A bookstore table for The Archive of the Unfound. Aj as Muse. 
Rewoven, Soft as Dream, Sharp as Magic, and The Sycamore.
The books
Start anywhere. Stay for the one that feels like home.
Find Aj online
- X: @FictionsByAj
- Amazon author:Author store
FAQ
Who is Aj Castelletto?
Aj Castelletto (also A.J. Castelletto) is the author and illustrator behind Fictions by Aj (@FictionsByAj), writing cozy, comedy, and fantasy.
What is Fictions by Aj?
Fictions by Aj is Aj Castelletto’s author brand: catalog, notes, and appearances.
Where can I follow new work?
Follow @FictionsByAj on X and check the blog on this site.
How do I get in touch?
Start with @FictionsByAj or the Contact page.