Thread:BowserRulesAll/@comment-11564515-20171228024813/@comment-27109830-20171228110213

Both of them were students of famous yet odd schools (the Hunters Exam and DWMA). Even though their typical behavior would indicate otherwise, these two happen to hail from two of the most infamous and deadly clan of assassins known to man, though they rejected their morals and ideals because, surprisingly enough, Killua and Black☆Star have their heart in the right place, and would reject any temptation to become evil. Likely due to their heritage, Killua and Black☆Star were one of the best in their class, easily outshining most of their peers whenever they were serious. Due to their respective educations, they can freely harness their soul for a variety of techniques, however, their bread and butter seems to be incredible speed, as they have multiple techniques revolving around that category.

That, and it's fun to debate seeing as it's actually fair compared to Killua's other options... as well as Black☆Star's for that matter.