Glad Red Paratroopa
From the Super Mario Wiki
The G. R. P-Troopa (short for Glad Red Paratroopa) is an enemy found on Vibe Island in the game Super Princess Peach. It is a very happy red Paratroopa that flies in a figure 8 pattern. If jumped on, it will become a Glad Red Koopa. According to the game's glossary, it "floats without a care in figure 8s while happy."