Why do they always make Kirby look so angry in American box arts?

[Khuutra]

Because angry Kirby is hilarious.

That's all. He's funny as Hell. Kirby by himself? Awesome. Kirby with a pissed off expression? Doubly awesome.

Think: what did the best cutscene in Brawl have?

That's right.

Angry Kirby wrecking Bowser and Ganondorf's shit.