I have made a groundbreaking discovery: Peppa Pig did die in Smash Brothers Ultimate: world of light. How do I know this?
To start, we all know Lucina (Fire Emblem) hates Peppa pig. But why? Through long studies ive figured out that Grima and Peppa Pig are the same entity due to… a very long and painful discussion. To make a long story short, their similarities are uncanny. This also explains why Lucina hates Peppa Pig so much, because if Peppa Pig is Grima, then Peppa Pig killed her father.
“How does this relate to world of light?” you may ask. We have to think about the story of Fire Emblem Awakening a bit. The main character, Robin, is a vessel for Grima. Essentially, Robin IS Grima.
Robin is a character in Smash Bros Ultimate. Robin DIED in world of light, so Grima DIED in world of light, so PEPPA PIG DIED IN WORLD OF LIGHT.

Thank You