Yeah you can learn more of Yagyu (and the friendship with Nioh) in Nioh path! If Yagyu is the romantic guy, Nioh is the Cute xD, you can see more of Yagyu with others chars, i found a video of Kin-chan path, is Kin-chan talking with Yagyu, you can see here: http://www.nicovideo.jp/watch/sm9783886 (i funny but i don't understand all Lol)

Some chars call you by your name, don't remember very well :/ (and i little confuse, because i use the name "GYS GyS" and "GyS GYS" ... and in the middle of the game i forgot which is the name xD)

Well, see ya later :D! Adieu~