Trunks and Bulma. For those that don't know, Trunks is from the Future, his mom is Bulma and his father is Vegeta, at this point Bulma is oblivious of this (obviously). On another note those subtitles make it a lot funnier!
Master Roshi- my first ever encounter with a really funny Japanese pervert. I actually grew up watching DBZ and I caught every single episode up to the end of Freeza. This cosplay complete with naughty girly magazine? The man in that suit deserves a handshake and a used underwear. Dragon Ball the manga is HILARIOUS and I highly recommend it.