Beezley

Beezley is a bee enemy coming from  that is also an enemy in the infamous Adventure level in Super Smash Flash, Floating Islands.

In Super Smash Flash
Beezleys are one of numerous aerial enemies in Super Smash Flash, alongside Flying Goombas, Buzzers, Mayu Birds, and Pearl Birds. They are exclusive to the aforementioned Floating Islands, where they follow the player around where contact with them results in the character taking damage and getting pushed back a bit. They can be taken out with a single hit, as usual for all enemies in the game.