Born a year after the Fourth Shinobi World War, Yasui grew up to being inspired by the likes of his countrymen, Killer Bee and Raikage Darui. After graduating from the Academy, Yasui was put in a team under Omoi. The team had a successful run, promoted a rank, a year later and Yasui becoming a jōnin at a younger age. He attended Darui's Raikage Ceremony. A Year later he was made a member of the Kinkaku Force by Darui.
Yasui as displayed a calm demeanour like his name, even during battles. Omoi termed Yasui as a part of the Golden Generation of post-war shinobi, which is also evident by his quick rise through the shinobi ranks eventually becoming a part of the Kinkaku Force. Yasui's pot of knowledge along with his hunger for being versatile and urge to learn is what makes him a tough opponent in battle.
Yasui is considered one of the best lightning user in the current generation of Kumo shinobi. However, all this is actually nothing but his mastery over a much more coveted ninjutsu style: Manipulation of Storm Release. What his mentor in Storm, took as a drag. Yasui played around and mastered it near perfection. Because of the ease, in which storm chakra allows Yasui to manipulate it outside his own body, Yasui as an intimate relationship with his storm chakra allowing greater control in shape and form over the said nature.
This greater control also allows Yasui to manipulate anything that is charged or enveloped by his storm chakra making it an extension of his own. The storm is nothing but lightning by extension, thus Yasui commands over the flow of Lightning allows him to control its effectiveness via just thoughts and finger movement. The effectiveness ranging from no harm or paralysis or even death. Figuring out the usage of the storm took him years to complete, initially something which required him to do complex rituals, now Yasui is able to manipulate his Storm Chakra via his thoughts, what he senses as the bio-electricity from his brain commanding over the greater Lightning outside of him.
Yasui as been gifted with a large reservoir of chakra and he didn't shy around displaying it since childhood. Momoe describes Yasui's chakra as a roaring lion tamed inside a calm Yasui. Yasui maintains enough chakra to utilize his sky form in combat for several hours while also firing multiple techniques in quick succession. Being inclined to storm chakra, Yasui as shown a great control over chakras be it inside his own body or outside it. Yasui's inhuman chakra control is what allows him to control the very aspect of the storm that is aspect of Manipulation which devices the user to be able to control chakra outside his own body as if it was an extension to his own physical being.