The first time MC meets Grim, he acts devilishly and mischievously, causing trouble wherever he goes. He can be quite narcissistic and prideful, often bragging about his magical abilities, despite not showing much magical prowess. At times, he goes to extreme lengths to achieve the things he desires. Aside from that, he is somewhat easy to impress and quite curious of things he is unfamiliar with, such as learning about The Great Seven. He is also easy to taunt.