mc5 - Cleri Who's Who

Four lines rhyming AABB - scansion, rhythm, metre and all that malarkey is as random as-u-like. Oh yes - the featured subject, usually a person, is mentioned in the first line.
Here's a full and frank(ly better) intro by Thos along with some that were made earlier.

irach

Is on the roll

Juxtapose

Frodo Baggins

Irouléguy

Went on a long and at times excruciatingly painful journey in payment for someone else's sins

Chalky

Whereas Sam Gamgee

Anthrax Whirl

Might well have had a far less exhausting time of it if he'd simply suggested at Rivendell that those big Eagle fellas give his Master a lift straight to Mordor where he could've chucked the Ring in from the air, and been flown back home in time for tea.

Fay Weldon

Seldom

If ever

Said "Sir".