I still didnt think their personalities through so I might make some changes to their MBTI

Warning: still no INTJs

Easy: ENFP
Normal: ISFP
Hard: INFP
Harder: ESTJ
Insane: ESFP
Demon: ISTP
Easy Demon: ISTP
Medium Demon: ENTP
Hard Demon: ESTP
Insane Demon: ESFJ
Extreme Demon: ISTP
Auto: ISTJ
N/A: im still deciding lmao