[MatoriSan]

Yeah, there is a nickname I use most often... Velja (Velya) (that's tricky to pronounce until you get the trick with lya, since the lya is supposed to be pronounced like the lla from the spanish word "callas" - if you saw the "porque no te callas" video you'll see what i mean)... but i doubt there is that kind of "lya" in japanese speech so I might consider something else. Some people call me by my initial letter so I think "Vii-san" and "Vii-kun" sound quite natural.