This is a list of some references to Fire Emblem and cameos in popular culture.
In the Great Cave Offensive of Kirby Super Star, the Falchion made a cameo as one of the treasures and items along with the other items from other Nintendo games.
In the English version of Kirby Super Star, the Falchion refers as "Sword". However, in the DS remake (Kirby Super Star Ultra), its referred as the "Falchion". 
“There's this one game that just absolutely rules. It's called "Fire Emblem"...”
—Young Toad raves about Fire Emblem: The Blazing Blade to Mario In Petal Meadows village, there is a young Toad that you can talk to you and he said that his favorite video game is Fire Emblem. and he said about the game that it rocks his socks. This game was also developed by Intelligent Systems.
Archanea (North American localized version name of Archanea in Fire Emblem: Shadow Dragon) was referenced by Princess Piazza when the player has their party attempt to sneak into Trantian's giant wooden horse heading for Troy and Princess Piazza tells a lie to sneak on the horse:
“I am Princess Piazza, representative of Trantia's ally nation of, er, Archanea”
—Princess Piazza in Glory of Heracles refereed about Archanea. 
The Fire Emblem series by Professor Mushroom is also mentioned in the FAQ in Part 2, Chapter 1: Green Hill on Volume 2.
In the 2nd issue of IDW Publishing's My Little Pony: Friendship is Magic comic miniseries, Legends of Magic, Lucina, shown as a blue pony, makes a cameo appearance as one of the ponies cheering on Rockhoof as he is eating a large quantity of oats from a boat-shaped bowl.