Board Thread:General Discussion/@comment-24111359-20140928213322/@comment-477304-20140929202847

A number of things:

Sonic's parents have never been mentioned in the games, there's no indication that they're dead or roboticised. Also, Sonic's birthplace is Christmas Island, not South Island. The Japanese manual of Sonic 1 suggests that the two were already enemies before the events of the game.

Your argument for Shadow being of a stronger will than Sonic is because Shadow never killed any members of GUN. This however makes no sense as Sonic has never killed anyone either, as the majority of his enemies are lifeless robots.

Where did all this nonsense about Sonic being "internally broken?" There is nothing to suggest that Sonic is like that, Sonic is shown to be cocky. arrogant, carefree, and hates injustice. Any actual bursts of anger by Sonic are often short-lived or in small bursts, he's never broken down. There is no proof that Sonic is mentally unstable.

Lastly, Shadow is an antihero, he puts his own agenda first, though he hasn't recently been shown to serve the forces of evil, that doesn't always mean he'll come in the save the day. You mentioned how Shadow wouldn't acted like Sonic did in Lost World, but the fact is, Shadow wasn't in Lost World. He wasn't trying to stop Eggman, Sonic was.