Because the term is highly specific to a niche persona or a particular online handle, could you clarify what kind of "feature" you are looking for? For example:
Her writing often focuses on protecting freedom and the meaning of life against algorithmic or dictatorial control, mirroring the philosophical clash between President Coin of District 13 and President Snow. 3. Fanfiction and "OC" (Original Character) Stories On sites like Archive of Our Own (AO3) nini district13