Coined by Pantherlily, they are a trio of Exceeds whose companions are Dragon Slayers.
Pantherlily - He is a former soldier under King Faust in Edolas and a banished Exceed. Now, he is Gajeel's partner in Earthland.
Happy - He originally was born in Edolas, but Shagotte orders 100 eggs including Happy's to be sent to Earthland. Happy became Natsu's partner at birth after Natsu finds his egg. With Lisanna's help, Natsu and she take care of Happy's egg. Happy is their adopted son.
Charle - Like Happy, she came from Edolas as an egg. She and Wendy are partners prior to the Nirvana arc. She cares deeply for Wendy and gives her advice.