Both Japanese and Chinese use kanji characters. Japan started to adapt the written language from 500ac to 1000ac. As Chinese as a language is nothing like Japanese, Katakana and hiragana were made to be used with kanji so they could be read in Japanese (they were however not originally used the way they are now).
Well it depends
if Kanji likes dick, then he's gay
if Kanji likes chicks with dicks, that's also gay
if Kanji likes these guys only because they looked like girls, but then doesn't like them when he discovers they're boys, he's no homo bra
depends what Naoto looks like
if Naoto looks like a girl but has the "guy" feel to it, then mentally and socially speaking Kanji is confused, but his instincts tell him to tap dat ass
Sexuality comes down to the genitals. What kind of genitals are you okay with being sexually involved with?
So Kanji is gay (bisexual if he also likes girls).
I personally just find feminine form and mannerisms attractive. I mean, I have absolutely no desire to suck dick, and if anyone tries putting something up my butt we're gonna have a problem. But if I met and connected with a girl only to find out they had a dick, I can't say for sure I wouldn't **** her/him. Then again I haven't been in that scenario so I don't know. Still like dat pussy tho.