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Well, In looking at decrease as a continuous effect, I'm not sure if that's correct or not though.
How to PlayIncrease or decrease abilities can increase strength and toughness, decrease strength and toughness, or change the strength and toughness to a new specified amount.Increase or decrease abilities can by dynamically conditional, statically conditional, or unconditional.Dynamically conditional increase or decrease abilities are ongoing. Dynamic abilities are typically designated by a “*” or “x” on the card. All other increase or decrease abilities are instantaneous. Increase or decrease abilities target the card(s) whose abilities are changed.[quote/]
I'd argue that a card that says 'all characters' should be defined as a continuous effect, that means all Characters in play (or put in play) during the battle phase will decrease because of Hunger (unless Protected)...
... this also means that interrupts will interrupt a decrease too.