I'm trying to ask this as seriously as I can. I'm not trying to made rude or vulgar jokes but seriously... They eat they drink and eat and drink but never is it implied that it goes out anywhere. Who do they think they are? Kirby!? Does Sonic have a metabolism that goes faster than the speed of sound?

I think I saw a toilet once in the Archie comics. It was in Sonic's room I believe. Well? Theories anyone?

LOL well this is funny I must admit xD

It's like in most other kids "anime". They don't really show toilets or them going to the bathroom =P Unless it's one of those funny moments. I dunno xD

But in Sonic X (the japanese version) they showed Chris taking a shower so I BET there had to be a toilet in there =P

I do know in SatAM there was scene where Tails said "Sonic, I need to go REAL bad!" they do use the toilet, But it never implies where it actually comes out of...

Maybe they do go to the bathroom but not when we're looking!

why do u need 2 show them go 2 the bathroom, not 2 b rude but it's inappriate besides your kid could b watching that

My theory: Sonic is so fast that whene you talk to him, he goes to toilet, do what he needs to do and come back so fast that you don't realise that he went somewhere.
These theory applies for Shadow too.
For others, don't know. :T15:

Uh huh.

I guess you didn't see the "Everyone Poops" video when you were a kid. Or you didn't see that one Rugrats episode when Chuckie's being potty trained. Not saying you need to show it but all those chilidogs gotta go somewhere!

They simply use the toilet off-screen... O.O

I gotta go with Sunshine here. Most shows really don't show people going to the bathroom, as it would probably be....a little unfitting for most shows to show stuff like that. XD

Sonic doesn't have... You-know-what to pee though O.o

And he stores the chaos emeralds in his butt, if he has one. (Not joking, in Sonic Unleashed you see where he gets it from.)
7:09
http://www.youtube.com/watch?v=aYyFWEVF-8E