I saw "X" at the west Fally bank, and Mummy Zenior (who isn't famous, but Rs' first Ultimate G mauler (99 str, 99 range, 99 mage, 1 pray, 73 cb)
Other than that, nothing else
I've seen "lol" once in fally, nothing else really special. It would be cool if they got all 26 1 letter names to get together in alphabetical order rofl.