Notes: Sakuya is a fictional champion concept, based off of the Touhou character Sakuya Izayoi, and her skill set is heavily influenced by the Defense of the Shrines character Sakuya Izayoi. This page is a work in progress, and not the final version of the champion.
Pictures are the same as the Defense of the Shrines version, which in turn come from Warcraft 3.
Sakuya starts with a fairly low base movespeed, but it gets much better over time. Shutting her down early will hurt her significantly, but letting her get free CS will allow her to roam early on.
Harass every time you see an opportunity with your Silver Knife skill. When they get low, wait for your passive to come off of cooldown, then Misdirection to close in, and finally Checkmaid, Silver Knife, and Ignite to finish them off. You don't really have a particularly weak game until level 6 since your damage is a combination of cheap skillshots and medium range cones, but when you hit 6, the amount of burst you get is pretty absurd.
In general, Sakuya is meant to use Checkmaid to push lane, then roam hard and land kills with her Private Square. You need a substantial amount of mana to land your full burst, so Tear helps a lot. Either manage her mana carefully or build to compensate for it.
Best Sakuya NA Build
Consider picking up one or two Doran's Rings or building a fast Haunting Guise, then going for some heavy hitting AP items like Rabadon's Deathcap or Deathfire Grasp. Tear isn't a terrible idea if you think you need more mana for your absurd Private Square burst. If you feel you can manage her mana properly without a Tear, just go for a Haunting Guise or something else that will help out her early game damage. Stack AP hard once you have enough mana to use your full burst consistently.