Fbianon was a different one in the past. Dont know if there is an archive of it. Found these two links with a search-
https://educate-yourself.org/cn/Full-Text-of-FBI-Anon-Q-and-A-on-4Chan-Blog-July-2-2016-22oct16.shtml
https://steemit.com/fbianon/@ausbitbank/fbi-anon-returns-to-4chan
There is also one called bdanon who is still posting on 4chan, archived at paulfurber.net/bda/index.html
They could all be fake larps, but I imagine they are white hat ops similar to what Q is doing. Of course Q is the most popular and has provided some big proofs like synchronized potus tweets and AF1 photos. But each "insider" has provided helpful info through a different style of "character", designed to connect to different types of anons on different platforms. Example, bdanon cusses a lot, talks about big boobs and being drunk and college football, and chopping fingers off of bad guys. That probably connects to some of the people that Q didn't, like alot of the anons on 4chan think Q is fake.
Anyway, whether these insiders are actually real people or an online persona being played out, and even if half of what they say is intentional disinfo - I think these are probably operations to help with the spread of info, to be a public annoyance to the black hats, to call out lies in msm, to drop a few hints about what to dig on and what is happening behind the scenes, and to let anons know they aren't alone or crazy.