There is evidence both for and against
For:
He appeared in Sonic Riders
He and his friends are very fast
It was proven that NiGHTS is apart of the Sonic universe so why can't Aiai
Against:
He doesn't look much like a Sonic character
Implied that he speaks another language
Hey, sorry but I just don't know. Where is it proven that NiGHTS is in Sonic's world? Thanks..
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It was proven that NiGHTS is apart of the Sonic universe
lol wut?
**reads again** Hey, you know what? You're absolutely right. NiGHTs is "apart" of the Sonic universe. Or rather, that's the most logical conclusion.
But to be more direct, just because there's NiGHTs Pinball in Casinopolis and blimps advertising his likeness doesn't mean there's a real NiGHTs there. In Sonic's universe, he's probably just another popular video game character... with a better marketing campaign. 😉
Riders? Guy in suit.
Aiai to star in new Sonic game on 360! His abilities would be to...uhh...roll and...uhh...roll! I didn't really think the two were even made by the same team much less in the same universe! I could be wrong however!
I want to believe that all Sega characters live together in Sega world and stuff.
But they will never do that.
Aiai, NiGHTS and such aren't a part of the Sonic the Hedgehog universe. Bonus characters entirely separate from the story and homage-paying cameos don't really mean anything.
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I want to believe that all Sega characters live together in Sega world and stuff.
But they will never do that.
When Ulala and company enter the Sonic world in a way other than a pinball game or a karaoke (along with NiGHTS and AiAi), let me know. kthnx!
Sonic Riders, DoN. 😛
Besides, I saw a YTMND of Bendilin's that asked if NiGHTS was apart of Sonic' universe and thwe answer was yes.
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apart
I don't think that word means what you think it means.
Basically you're saying NiGHTs is "one of those things that's not like the others, one of those things that doesn't belong".
"A part" = A part
"Apart" = Seperated
You guys knew what I meant though. Smartasses. This is causing ALOT of trouble. 😛
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Sonic Riders, DoN. 😛
It's not cannon! 
Whether Monkey Ball and Sonic are in the same universe, depends on the game I think. Just like how Capt Falcon and a dozen or more are in Smash Bros. but not in the regular Mario series. I would consider AiAi canon to the Riders, but not the "main storyline" i.e. Sonic S3+K, Sonic CD, Sonic Adventure games...
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ALOT
"A lot" = a lot
"Alot" = a town and a nagar panchayat in the Ratlam district in the state of Madhya Pradesh, India
<quote>It's not cannon!<quote>
How do you know this? Just because it isn't a platform game doesn't mean it isn't canon.
I swear, you guys are giving me aheadache.
Before someone else does this.
"headache" = a pain in the head
"aheadache" = headache with an "a" attached to it.
It's kind of funny how no one is taking this post seriously.
The way I see it is: Unlockable characters not utilised in the actual storyline = outside of the realm of canonity. I doubt Tikal actually come back from where she went at the end of SA1 to play Treasure Hunt races with Knuckles in SA2/B.
Personally I'd prefer that all of the anthropomorphic animals in Sonic's world met the same design style, so no, I don't think AiAi and company are in Sonic's world, and I'm glad about it. The series has become Teletubbied enough already without those crazy critters, anyway.
*sues Abac*
If only the Sonic franchise was not in the state that is now...
...
*sues Abac* -> the action of placing a lawsuit to a person named Abac
*suesabac* -> means nothing. I just forgot to place a space between words. Just in case you all think I'm lying, here's a google search page because you are all so wonderful. 
This topic has gone out of control.
AiAi is not even sonic franchise. He was just put in there just for the heck of it. And yet, they didn't feel that Ristar would fit the bill instead of a monkey.
As for other characters, I'm not sure. Just pretend that they are since they have appeared in many games together:
Sega Superstars
Billy Hatcher
Sonic Pinball Party
Riders
*counter sues Acrio*
In before anything Pheonix Wright related.
Also, non-canon apperances all round. Only the character involved in the main story are canon. Everyone else is just a bonus.
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This topic has gone out of control.
If you click on the link that I just gave you, it'll lead you back to this topic.
What did I just created?
How did that happen? Kind of strange if you ask me.
