[Tomisimo]

Originally Posted by Sancho Panther

Re-reading that slightly baffled me, surely there is no ambiguity there; it's "Carácteres" i.e. the same isn't it?

Singluar: "carácter" spoken stress on the second "a".
Plural: "caracteres", spoken stress on the first "e".

Since the plural ends in "s" and the spoken stress is on the second to the last syllable, there's no accent mark.