ConraDargo
Despite being a member of the community since late 2003, the name ConraDargo may not ring a bell in everyone's ears due to his low average of posts (~1.1 per day), but even this member has still managed to leave a mark on the community; his most noticeable work consisting of a huge compatibility list for the SNES emulators PocketSNES and SNES Advance on Game Boy Advance in 2004, where he tested more than 2000 (!) SNES roms, and a personal guide to flashing a Nintendo DS Lite which was posted in late 2006 - only days before GBAtemp's own guide went online.
The username can also be seen on numerous other forums (namely Swedish ones) and is easily recognized and spotted by the avatar that he always uses: the two mysterious eyes which covers the EU-case on the early 90's popular platform game Flashback. ConraDargo's dedication (and crazy obsession) towards this game is also shown through his huge Flashback game collection (one copy of the game for every system that it was released on), his DS and credit card (!) both looking like the EU-cover, and even making a fake Flashback DS game which includes both a fake cover and game card.
ConraDargo is also the author of two FAQs: Koinu Chan no Hajimete no Osanpo for the Game Boy Advance, and the Japanese version of Nintendogs on Nintendo DS - for which he has received a lot of credit.