Synopsis
Kastro is a Heavens Arena fighter whose bout with Hisoka became one of the 200th floor's most memorable. He had faced him two years earlier, scoring a knockdown and three points — the only person ever to manage it against Hisoka — and still lost.
He was a well-built man with blue eyes and loose white medium-length hair reaching his upper back, dressed in a yellow hoodless cloak over a black-trimmed white robe, with white trousers tucked into grey boots.
Kastro came across as calm and reflective: he greeted Killua courteously and complimented his Zetsu and the strength of his aura. He was also cautious, keeping tabs on everyone on the 200th floor. Behind the composure, though, ran a capacity for holding grudges for a very long time.
After that defeat he trained his Nen relentlessly and racked up nine wins, concealing his double ability throughout. Many rated his skill on par with a Floor Master's. Voiced by Tokuyoshi Kawashima in the 2011 series and Yūji Kishi in the 1999 one.
