Mukuro does a few handseals causing it to rain .As i focus my chakra into the sky, i use shape manipulation. I then create a nuclei out of rain which causes my rain to move down faster, initially making the it easier for bigger rain techniques
(Suiton: Ukojizai no Jutsu) - Water Style: Rain Tiger at Will Technique
Rank: C
Type: Supplementary
Range: Short-Long
Chakra cost: 15
Damage Points: N/A
Description: A perception ninjutsu, allowing one to freely manipulate rain infused with the user's own chakra after waving the Bird → Rat → Ox → Monkey → Rat → Snake hand seals. The rain falls from rain clouds, formed with the users own chakra. During this technique, the falling raindrops are closely linked to the users senses. When the rain is obstructed by a chakra belonging to someone the existence of the target can be detected. The rain will keep on falling until the user uses the seal to cancel it.
Ooki Kouu no Jutsu) - Big Rain Skill
Rank: B
Type: Supplementary
Range: Short-Mid
Chakra cost: 20
Damage Points: N/A
Description: By sending subtle chakra waves into the clouds, the user is able to create unusually large nuclei for the water droplets to condense on. The end result is big raindrops that fall to the ground at a faster then normal rate. They aren't big or fast enough to cause any real damage, but they are quite distracting.