He's always impressed by his enemies and can't help but yell it out in some way (which usually involves his eyes transforming into stars and his jaw opening incredibly wide). Luffy abuses this word (and sugee) perpetually. It's rarely uttered about everything and anything under the sun. While sugoi is a way of conveying how cool something is, you’ll find that characters usually say it in reaction to something specific. All he can do is stand there as he takes it all in and say, 'Amazing,' before finding the words to continue: 'This world I've only seen on the internet and in comics is finally right in front of me.' Mikado, never have been to Tokyo before, is highly impressed when he gets off the subway and sees the city for the first time. In the first episode of Durarara!!, Mikado Ryuugamine moves to Ikebukuro at the behest of his friend Masaomi Kida. As mentioned above, when a character exclaims 'Sugoi!' or includes it in a declarative sentence, they're generally trying to express that something is great or amazing. There are essentially four ways sugoi can be used in Japanese. But young women have also been known to go this less formal route as well. There's also a very informal version of sugoi - sugee (すけぇ). But it also appears in various phrases like 'Sugoi ne!’ (すごいね) which means 'That’s so great/amazing!' Many times, characters will just say 'sugoi' on its own.

The word ' sugoi' (すごい) can be translated as 'great' or 'amazing.' You'll generally hear it being used as an exclamatory expression, like when a character sees or experiences something that's, well, great or amazing.

The difference is that sugoi is actually a common expression. It's kinda Luffy's thing sort of like Naruto's catchphrase 'dattebayo'. If you're the kind of fan (read: dub hater) who looks for anime by putting something like this in Google search - ' One Piece episode 1 SUBS SUBS SUBS' - then you've probably heard a few characters, especially Luffy, yell out 'Sugee!' (the informal version of sugoi) a couple of times.

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