I like the name Daisuke Niwa ^.^
Well anyways, my is Ningi and it should sound familiar to ]00 :P
Nin: The initial Kanji for Ninja - It represents the blade over the heart (yaiba and shin), but its not to be seen as a bad thing: It means Kajoo Waraku, a heart as pure as a flower blossom. A heart which shall enjoy eternal peace.
The meaning of it is difficult to grasp for other people, but for us Ninja it has a foundamental meaning. A meaning of perseverance, stealth, endurance and conciliation. The principle of Nin is to persevere even when the heart (shin) is facing darkness (yaiba). It ish even more deep, but even I still don't know on how many things it can apply. And If I start explaining, you would take it as a blah blah blah xD
gi: The gi in Ningi has different meanings for me, but they're not as much relevant as Nin. It has some meanings that I can't really explain cos they're weird though xD!!