Mercutio has to be one of my favourite characters, and you have more than done him justice with this poem. I hate Tybalt...'a cat that runs away in fear' is exactly right! (And I love the death scene too).

Very „mercutio-ish“ ;)
I'd pick out a few lines I liked best, but that's too difficult, there are so many. But I'd say, the last two verses are my favourites (I just have a thing for death scenes - and for Tybalt too, by the way. ;))
Very well done. :)