More disadvantages could be that the reflection is destroyed with one hit and that it can only be made in the rain for obvious reasons.
Anyway, moving on.
(Amegakure No Jutsu) - Hidden Rain Technique
Rank: C
Type: Supplementary
Range: Short-Mid
Chakra cost: 15
Damage Points: N/A
Description: A jutsu that can only be used in rain to conceal oneself, this jutsu is considered a dynamic form of henge. After performing a row of hand-seals, the user seems to disappear. In truth, they have merely assumed a form that mimics rain. Fast movements and physical contact with others may reveal the user
Focus your chakra and create rain. Once there is rain this jutsu can be used.
Focus your chakra once again and perform the needed handseals after which you seem to disappear in the rain.
(Hitoshirenu Ame Sai) - Hidden Rain Slash
Rank: C
Type: Attack
Range: Short-Mid
Chakra cost: 15
Damage Points: 30
Description: The user manipulates their chakra to condense a single raindrop into a more solid form. The raindrop becomes as sharp as a blade. The disadvantage to this jutsu is that the raindrop falls in a straight line.
Focus your chakra and manipulate it to condense a single raindrop into a more solid form, becoming as sharp as a blade.