No to both.

--True Red

Those are all different Archie-related versions of Knuckles. The possible future versions could have resulted from Knuckles #25, Sonic #106-109, Sonic #131-144, or Sonic #166-167. The Brass Knuckles would refer to Sonic #103. The Sally McAcorn related one would come from Super Special #14. The mutant would come from Super Special #12. There are more alternate versions of Knuckles than that from Archie, including the "Anti-Knuckles" from Sonic #44, a Gatchaman/G-Force parody from Super Special #12, and a Sailor Moon parody from Super Special #8.

--True Red

Sega mandated awhile back that Cream can only appear in the Sonic X series. So until Sega changes its mind (assuming as of right now that it has not) she will only appear in their Sonic X series.

--True Red

Freedom Fighters of the Galaxy (formed by Hawkhawk)
Tails - Tailon
Sally - Saleta
Rotor - Captain Rotor-27
Antoine - Twan-Du
Bunnie - Bunni

Villains
Echidnas - Brass Knuckles (all robotic echidnas with "Guardian" rings, but no "knuckles")
Forty Fathom FFs - The Shark
Snively - Silver Snively
Robotnik - Robolactus

Pictures of most can be seen in the comic scans section for #103 and #104.

--True Red

It's not Amy grew up, it's just that they changed her age. She's not the only character it has happened to within the games (or other Sonic universes, such as Archie's comic). The Chaotix when they were re-introduced in Sonic Heroes had their ages changed from their debut in Knuckles Chaotix as well. -True Red

Despite the games and comics having their own continuities, you're mistaken in thinking the backstory is different. In both Shadow was genetically engineered by Professor Gerald Robotnik with assistance from Black Doom.

~Crazy C Lea

Both comics will continue as long as they are profitable--meaning enough people buy them. So, no, there's no set date to end any of them. --True Red

You can monitor this topic for games. Anything else that takes contributions is already able to be read on the site itself. Tails' Skypatrol isn't near the top of the list though to be worked on, but state your case and maybe it'll move up. --True Red

Considering we do not have affiliation links with most of the stores listed in the store, we have no way of truly knowing how much traffic we drive to the stores listed. We don't sell anything, just provide links to some places that do. There are usually more options than what is listed (especially for popular stuff such as the games), but until the site changes (which it is), it is not currently even feasible to keep track of most of the the online places to buy stuff. --True Red

You've probably seen him without realizing it. He's on the cover of Sonic #129. This is his current profile pic in encyclopedia (yes I do know they aren't showing up--it's not that the images aren't there, it's the links to them are bad), which is the same image, but only from about the waist up. This is a scan of his "appearance" in Sonic #134. --True Red

On the team select screen, press right.

~Crazy C Lea

Considering he just made his video game debut recently (not even a month ago), he wouldn't be in the encyclopedia. His name is Silver, introduced in Sonic The Hedgehog for the 360/PS3. Sonic Rivals is the second game to have him. --True Red

The encyclopedia, comics, and cartoon sections should be where you go--not here. Those places will clue you in on many of them. --True Red

As I mentioned earlier (though granted the person asked only about the encyclopedia) when someone fixes the script in terms of the links to the images, that's when they'll work--not before. If it ends up that I have to do it, it won't happen until January because I'm working mostly on my other website right now. Any image that won't load now is due to the fact that they appear due to scripts. Most images that are linked directly (mainly comic scans as an example) will work fine. --True Red

1) When someone fixes the script in terms of the links to the images, that's when it'll be operational. If it ends up that I have to do it, it won't happen until nearly January because I'm working mostly on my other website right now.

2) Not restricted, but at least one script file needed hasn't been uploaded. So that can fixed faster. Thanks for the heads up.

--True Red

"Ashura" is the Sonic 2 (Genesis/Megadrive) glitch that is a Sonic recolor. The fans that discovered him created a backstory for him, including that he is Sonic's brother. --True Red

Yes, one of the many Sonic prototypes was a rabbit/bunny. --True Red

You can call it a universe switch, but keep in mind that they aren't the same characters at all though Archie used the names from Sonic Underground. Archie: Sonia = ground squirrel (around 15-16) similar to Sally in design; Manik (with a "k" not a "c") = blue hedgeghog (around 10-11) similar to Sonic in design. Sonic Underground: Sonia = pink hedegehog (15/16); Manic = green hedgehog (15/16) where both are different from Sonic in design. --True Red

1) Tails has always been 8 years old (or younger in some non-Japanese sources) in the video games due to official sources, but never older. Tails was 10 in SatAM and Archie (though he's now 11 in Archie). AoStH (younger) and Fleetway (various) have had Tails at different ages.
2) Sonic's a mystery. It's been that way for 15 years and it'll stay that way until someone decides to change it.
3-5) #6.

--True Red

1) No
2) They never did as Sonic wasn't present in #150 but Evil Sonic (unknown to everyone) was.

--True Red