They are both hedgehogs.
Sonic:
A 15 year old anthropomorphic hedgehog with the ability to run at supersonic speeds. He is impatient, short-tempered and he cannot swim much. Using the seven Chaos Emeralds he can transform into his Super Sonic form, where his speed and abilities are greatly increased.
Shadow:
An artificially created being in the form of an anthropomorphic hedgehog, created using the DNA of alien leader Black Doom, by Professor Gerald Robotnik 50 years ago aboard the Space Colony ARK. He can harness the abilities of the Chaos Emeralds such as Chaos Control, Chaos Blast and Chaos Spear, he can also turn into Super Shadow.
no because they helped each other in the game
Shadow was a bad guy before then he knew nothing then sonic came and then shadow says who are u and sonic said im sonic then they fight then sonic won and they know each other now.
Sonic and Shadow are rivals so they don't always get along. They possibly don't like each other, but they probably don't hate each other either.
He likes sonic as a brother and loves shadow as a boyfriend and they will stick by each other till the day they die they will proboly love each other in heaven
Nope. They fight each other on numerous occasions, but Sonic is never killed by Shadow, nor vice-versa.
No, the Shadow the Hedgehog game and the Sonic Heroes game have different story lines that do not pertain to each other.
Yes. They are also madly in love with each other they are known as sonadowilver
Metal sonic doesn't love shadow he only has his mind set on Amy. But shadow loves metal sonic after his dear sonic was killed along with egg man when the egg breaker self destructed. Shadow loves metal soic because he reminds shadow of his dear sonic metal sonic finally gave up and got together with shadow they are know mown as metal sonadow.
They are allies, and both respect each other despite their differences, however no they are not friends, most likely due to Shadow's distant nature. actually sonic tries to be friends with shadow but all he says is hmph but after they beat nazo they start to like each other more
Yes they did in a sonic comic. {I'm not sure which one.}
to be honest i don't know but sonic does think of shadow of an ally shadow thinks of sonic as an ally even though they both still think of each other as rivals too they fight so much that it doesn't look like any of them are trying to be friends but they sometimes do it to prove something and/or just compete
Shadow by loads! I love Shadow! He's like legendary! Logically Sonic is better, because without Sonic (and Robotnik) none of the other Sonic characters would exist.