Smartest to dumbest character out of these Sheldon, Leonard, Penny, Raj, Howard, Bernadette & Amy

1. Sheldon
2. Leonard
3. Amy
4. Bernadette
5. Raj
6, Howard
7. Penny

1. Amy
2. Sheldon
3. Bernadette
4. Leonard
5. Raj
6. Howard
7. Penny

They vary in different subjects but here's mine overall:
1.Sheldon
2. Amy
3. Leonard
4. Bernadette
5. Raj
6. Howard
7. Penny.