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Since I watch a lot of anime, I end up hearing these two particles a lot, but
I've never been completely certain of their distinction, only that there
definitely is one. My dictionary listed them as a single entry with the
definition of adding emphasis, which seems to fit well with ぞ, but not quite
as well with ぜ from my observation. It also doesn't help that as far as I'm
aware, almost nobody says these in real life, or at least much less
frequently.
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2016-01-02T15:35:35.730
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sentence-final-particles role-language
Difference between ぞ and ぜ
In anime and other works of fiction, ぜ sounds more tomboyish, boyish and/or
childish. Typical users of ぜ are male kids from so-called 少年マンガ. For example,
[Satoshi](http://pokemon.wikia.com/wiki/Ash_Ketchum) from Pokémon uses ぜ
frequently. An adult male character rarely uses ぜ, while ぞ may be used by old
male people (and sometimes even by women who are speaking a bit playfully).

In the real world, ぞ is sometimes used in casual and brusque conversations
between adults. ぜ is much rarer, and no one around me uses ぜ actively. Even
native speakers can sometimes wonder [if there are any real people who use
ぜ](http://komachi.yomiuri.co.jp/t/2009/0805/255509.htm?g=11).
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2016-01-02T17:24:36.837
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answer
Your observation is accurate. There is difference between ぞ and ぜ, though ぜ
has almost died out, at least in greater Tokyo. Basically, ぞ just
straightforwardly tells one-sided subjective claims, while ぜ has function of
confirmation, request, or advice, only in a rude and self-centered manner. ぜ
couldn't be used if there's no listener, that is, you wouldn't speak to
yourself with ぜ.

The last remaining usage of ぜ occasionally heard around me is an indicator of
speaker's annoyance or vexation.

> これ以上待ってもしょうがないし、もうさっさと行こうぜ。  
>  _There's no point waiting anymore. Come on, let's go already!_
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2016-01-03T04:38:43.180
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