shadow is beast he got lots of girls to have his baby including amy.
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It hasn't been confirmed yet by Sonic Team, so you'll have to wait, but it is more than likely that Sonic will eventually fall for Amy, as she is literally the only one who loves Sonic. It is impossible for Amy to marry Shadow, because if she were to grow up as an adult, Shadow will still have his teenage appearance as he is immortal.
It is possible she is going to marry Shadow and her son is going to be Silver. It is possible!!! Actually, it is not possible because Silver and Shadow are from different eras. Silver comes from the far Future, about 100 Years after Shadow's debut. So, no, Silver is not Shadow and Amy's son. - The Sonic Maestro
Who would think that? Amy loves Sonic, she wouldn't fall in love with Shadow.
No he is not.
The reason is that they're rivals is cause sonic likes Amy and shadow likes Amy too