For my money, Kosugi is one of the more underrated seiyuu out there. He has a great natural voice for large, intimidating figures, but it’s not so deep that he can’t play more casual, laid back characters like Henken Bekkener from Zeta Gundam (a show he’s also the narrator for). Hilariously, he also voices K. Rool in the Japanese dub of the cartoon, which is a role that suits him well despite the ridiculous nature of the show.
His Arlong and DarkKnightmon are where he really shows off his villain skills. He really gets a lot of mileage out of that SHAHAHAHA Arlong laugh, and brings out the scumbag nature. He’s also got a lot of Digimon roles under his belt, but DarkKnightmon from Xros Wars is his biggest one, and my personal favorite. Though evil to the core, Kosugi’s performance genuinely makes DarkKnightmon seem honorable and affable at times, highlighting the regal, composed mastermind the character is.
He can even be on the goofier side with Mr. Legend from Tiger And Bunny, which is a range that’s useful for pretty much any actor to have, regardless of the type of acting.