I'd definitely put yo, or at least hey, to translate ciao.
as far as mitico is concerned, I found "homie", as American slang, meaning people from the same group. That sounds cool. Or "dog", as my English boyfriend suggested. Otherwise "man" is alright, or "dude" as long as you don't put "hi".
If you've watched the Big Lebowski, the main guy was called "The Dude", maning also "mitico", in a way.
Hope I've been helpful!