Mad Green Koopa
From the Super Mario Wiki
Mad Green Koopas are enemies in Super Princess Peach. Mad Green Koopas are a variation of Koopa Troopas which are permanently angry. The game's glossary describes that their personalities are similar to that of a spoiled child. Mad Green Koopas can also attack by simply rushing towards Princess Peach.
 Glossary Entry
Attacks angrily like a spoiled child!