LEGO doesn't work with SEGA. Nintendo works with K'Nex though, so SEGA's probably gonna have something for K'Nex more likely than LEGO. LEGO does more movie-based things than Video Games. One exception I can think of right now is the set of the Shadow-Fighter-thing-or-whatever for the Force Unleashed, and that's based off of Star Wars (a movie series) so that doesn't really count. To finish this answer, no there are no "official" Sonic Minifigs, but eBay tends to carry fan-made Minifigs of usually either decent or crappy quality.
metal sonic is not in sonic 3 only mecha sonic
You can find Sonic characters at Wikipedia and Google.
There is only one official Sonic RPG is Sonic Chronicles.
That all depends on the type of sonic
Try wikipedia or Sonic wiki.
in sonic x you can find it write sonic x episode 18.
sonia is sonic's sister in sonic underground you will find out about that and manic the hedgehog is sonic's brother
no not that i know but if you play it you can find out
There is no Sonic Heroes 2
you dont find Johnny in "Sonic Rush" however, you do find him in "Sonic Rush Adventures" just after you get past two levels (i think i havent played it in a while...)
Go on google and type in sonic spritesit will then say under sonic sprites the mysticalforest=)well if you go to the mysticleforestzone.com you can find sprites for just about any sonic character you can think of
yes you can marry sonic the hedgehog but first you need to find him