First one to come to my mind is "Insert PC from another campaign here."
That's what I thought of first, as I recall Final Fantasy 1 had "Sir Edrick" dead and buried. Sir Edrick is from Dragon Warrior 1. Similar lines of thought.
My personal favorite: "Here lies Lester Moore,
Four Slugs from a .44.
No Les,
No More"
And I personally came up with one for a halfling (who drank a very strong liquor called "Tup" and passed out) in our homebrew campaign this past weekend:
"Poor Garret,
Drank some Tup,
Went under the table,
and never came up."