"Kuriboh" does not target the attacking monster.
"Kuriboh" only prevents Battle Damage to your Life Points; it will not prevent your monsters from being destroyed.
"Kuriboh" can only be activated while in your hand, its effect cannot be used while
"Kuriboh" is on the field.
Using
"Kuriboh" is a Multi-Trigger effect.
"Kuriboh" is activated during damage calculation. If your opponent attacks with
"Injection Fairy Lily" and activates her effect, you can chain
"Kuriboh" to reduce the damage to zero.