sonic-coll.
So, I have looked a bit about his identity, and I'm pretty sure he is RYO, the bassist from defspiral:
- RYO's twitter and MySpace (which seems to have been removed) both are named "sonic_coll".
- Ryo is credited for a couple of Riyu Kosaka songs during her tenure at avex (BALA≠BALA, ignore, m.o.n.s.t.e.r).
- Ryo also composed music/themes for the Kamen Rider series, series which NAOKI seems to have connections to (notably, neuras, who also worked on Kamen Rider, avex, and with BeForU members).
This is the evidence that I have so far. --FinalOffset (talk) 17:51, 28 November 2017 (UTC)