I came across a short alliterative poem about Rorschach I wrote a good while back after reading The Watchmen:

Manic milieu meets maimed mien,
moralising meandering misanthropic menace,
metes most morbid measures masked,
macabre murmurs marry much moribund musings,
massacring measly men mirthlessly

I don’t know why I decided to pick ’m’ here for the alliteration, but I often enjoy writing such whimsical snippets. I’m not sure what you’d call this, but I suppose ’extreme alliteration’ or reverse lipogram would suffice. I quite like the whole field of constrained writing, it’s quite fun thinking about how to slot words into constraints just-so. Apparently there was (is?) a group of French mathematicians and writers who similarly delighted in such pursuits… the Oulipo (Ouvroir de littérature potentielle).

Amazingly, I asked ChatGPT who it thought the poem was about, with no other context provided, and it nailed it (link to chat).