It the same day as Sonic and Sonia's because they are triplets
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Ever since the original series from Adventures of Sonic the hedgehog, to Saturday Morning Sonic, to Sonic underground, to Sonic X, to current video games, there are many hedgehogs. The main hedgehogs are: Sonic, Manic, Sonia, Shadow, Silver, and Amy. there are others but carry a minor part in the Sonic series.
In the Sonic the Hedgehog series, Sonic has a brother named Manic and a sister named Sonia. They are collectively known as the Sonic Underground, a band of freedom fighters who work together to overthrow the tyrannical rule of Dr. Robotnik. Manic is known for his skills in thievery, while Sonia is a talented musician and martial artist.
They're the Hedgehogs.
sonic is older than manic in sonic underground
No Scourge didn't, in comic it says Scourge killed Manic, but Scourge didn't.