Amy's parents died long before Sonic CD. Her father died of an illness, as her mother was murdered by Metal Sonic.
Amy is allergic to blueberries.
Sonic was a prematured baby. His mother gave birth to him prematurely and tries to fight for his life. Vanilla (Cream's mother) and her sister tries to take care of him and made a blanket for Sonic and kept it ever since.
Sonic sometimes smells like blueberries.
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Strange Sonic Headcanons
RandomFrom strange headcanons around and between the cracks of the internet, I found the most strangest, and creepiest headcanons from the entire Sonic series. (Source: hedgecanon.tumblr.com)