Having a FL like this (Dumb and "innocent") is worse than Having the usual FL turn into Villainess troupe. Bc her brain cannot comprehend what is wrong and right , she just believe in the power of love, friendship and kindness . Also, they act like a damsel in distress and ofc, the "big brother"...
Dang the heroine is too delusional and the light spirit is so STUPID. Assuming the light spirit have lived for a very long time, the spirit should know that a person like heroine is a DEATH FLAG