What is the meaning of じゃぞう

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    せっかくのベッピンさんが台無しじゃぞう
    
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This sentence is said by an elder character on Mirai Nikki episode 6.

I understand that じゃ is an old way of saying だ but what about ぞう？Is that some
kind of 終助詞？

Could that be a misspelling of ぞ？




Yes, it is the 終助詞 ぞ. And not a misspelling, but a common way to spell its
elongated pronunciation (elongation stands for emphasis, btw).

Because of the overwhelming majority of existing words with long vowel _ō_
being spelled with おう, many people find it intuitive to write _ō_ that way,
even as phonetic transcription without etymology. A illustrative example is:

> おかあさん _okāsan_ "mom"  
>  おにいさん _onīsan_ "(big) bro"  
>  おねえさん _onēsan_ "(big) sis"

but:

> お **とう** さん _otōsan_ "dad"

The example above is already orthographically fixed, but in this case you can
choose to use ぞお, ぞー, ぞ～ (or even ぞ〰) instead, and it is perfectly fine
(though with subtly different nuances). It applies to other particles and
interjections that end in _o_ as well.

> よ → よお/よう etc.  
>  ほお/ほう etc.  
>  のお/のう etc.  
>  おお/おう etc. (but in the exclamation sense we usually stick to おお)  
>  （早くし）ろ → ろお/ろう etc.




Yes, it is the 終助詞 ぞ. And not a misspelling, but a common way to spell its
elongated pronunciation (elongation stands for emphasis, btw).

Because of the overwhelming majority of existing words with long vowel _ō_
being spelled with おう, many people find it intuitive to write _ō_ that way,
even as phonetic transcription without etymology. A illustrative example is:

> おかあさん _okāsan_ "mom"  
>  おにいさん _onīsan_ "(big) bro"  
>  おねえさん _onēsan_ "(big) sis"

but:

> お **とう** さん _otōsan_ "dad"

The example above is already orthographically fixed, but in this case you can
choose to use ぞお, ぞー, ぞ～ (or even ぞ〰) instead, and it is perfectly fine
(though with subtly different nuances). It applies to other particles and
interjections that end in _o_ as well.

> よ → よお/よう etc.  
>  ほお/ほう etc.  
>  のお/のう etc.  
>  おお/おう etc. (but in the exclamation sense we usually stick to おお)  
>  （早くし）ろ → ろお/ろう etc.

