Hermit
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Here's what I found about Shrek... he lived in a swamp, and Hermit's signature mentions a swamp, and hydras can generally be considered as snakes/serpents.
That's about it.
Also, I don't understand why Arandor is stuttering in the newspaper... did he change his signature?
Всё не так плохо как Вы думаете. Всё намного хуже!