Damage Dealer
First, just buy the boots so you can activate the passive of retribution to help you farm faster. After that, straight up prioritizing Hunter Strike to give you more mobility to enter a fight and runaway after that. You can buy the Magic Boots right after so you can have the 10% CD reduction. Next, prioritize War Axe so you can have the spell vamp as well as the 10% CD reduction. Queen's Wings is also a great choice because not only you gain another 10% CD reduction, you also gain spell vamp and Demonize passive which can save you from instant death due to its 30% damage reduction for 3 second, by also reducing you skill CD by 2 seconds. The rest of the item is actually just up to you. If u already snowball and you think you need more damage, buy Blade of Despair and Malefic Roar if your enemy is tanky. Addition: Actually, you can buy Skypiercer after finishing your Hunter Strike and Magic Boots, BUT only if you snowball and already secure so much kill. But remember, when you already lost its stack, just sell instead of keeping it.
Fast farm and Finisher
Thrill: You need more damage, so Thrill would be suitable. But if your enemy are mostly tanky, then you can use rupture. Seasoned Hunter: For fast farming, this talents will help you farm fast and roam around to pick off the enemy. Killing Spree: As a finisher, this talents are really needed to help you wipe out the enemy by recovering your HP after killing the enemy.
Battle Spell
As jungler, retribution is a must battle spell
Before level 4, you can actually roam around to kill the enemy EXP laner or Gold laner because Suyou already have his 3rd skill on level 3. So make sure you at least secure kill before continue farm
Aware with your map, and become the finisher instead of the inisiator. With his mobility, Suyou can easily enter a fight and leave immediately after secure kills. But, you can do a solo kill if the enemy is a squishy like a mage or marksman. If against stronger enemy, use a feint and retreat staregy, because after all, Suyou is a finisher. Since Suyou has 2 types of his every skill (tap and hold), make sure you know exactly how to maximize his potential. Skill 1: You can use your tap skill 1 to get close to the enemy or run from the enemy. But if you tried to eliminate squishy enemy alone, hold skill 1 so it can give a stun. Skill 2: If the enemy still have more than 30% percent HP, hold your skill would be better. Only use your tap skill to last hit the creep and the enemy with low hp. His tap skill can also be used by using retribution at the same time to steal the turtle or lord. Skill 3: You can use the tap skill to finish off the enemy. Make sure you know the range of his skill and know exactly where you aim it. Meanwhile his hold skill, use it to clear the minion or poke the enemy. It also can be used as finisher if the enemy manage to escape
Best With Kalea
Suyou can easily combo with Kalea because unlike other roam, she can provide a high level CC while also giving heal to nearby teammates
Watch Out For Yi Sun-shin
Suyou is fast, but Yi Sun-shin is faster and have immune skill which Suyou didn't have. So avoid doing 1v1 against him