Sonic the Hedgehog - When your grandpa grows a weird dog in a tube and now he’s your brother but also your pet, sort of.

First, and this is the most important part, you're taking the origin story of a cartoon hedgehog way to seriously.

Second, tragically killed loved ones has literally been a story trope since stories existed. No one is trying to say Shadow's origins are novel or unique. Don't say "we" here, this problem is your own and it needs to stay your own. I dunno why Shadow the fucking Hedgehog reinforces any kind of problem for you, your examples aren't even the best in the series they come from for what you're trying to say, and you've written nonsense.