In Season 5 Episode 9, "The Dance of Dragons", in the fighting pits one of the combatants is an unnamed Braavosi fighter who is wielding a sword similar to Needle.
Click images to enlarge.
Before this way back in Season 2 Episode 3, "What Is Dead May Never Die", Polliver takes Needle from Arya and kills Lommy with it. He is still seen wearing Needle ...
Joffrey is a combination of Richard II, Eustace IV, and "five or six people [GRRM] went to school with".
I see a huge amount of Joffrey Baratheon in Richard II. Both of them boy kings, both of them not really learned in the ways of being a king, absolutely drunk on their own majesty.
[first person involved with the show but I don't know their name]