The point in sockpuppeting twitter, 4chan, and the emulation, translation, and rom hacking scenes as Byuu is that you can harass them and embarass him in order to draw him out and make it harder for people to defend him. You could make an account on Gelbooru or something and start liking shota cub toddler porn or something, and leave comments compiementing the aforesaid asses while describing how much you want to violate them.
If you do it through Tor and via a public wifi network on a throwaway laptop, then you can talk about how much you, Byuu/Near or byuu/near or whatever the fuck it is, jack off to stuff like that and have a large collection of it hidden on your personal sites. That would be a lead-in that you can report to the police, and by getting them involved you get positive verification that Byuu is alive or dead.