Hirokuza by Pahpohranger

Hirokuza is an on offensive tank that can bring chaos and terror in any fight. He is best played as a safelane carry or a midlaner. His ultimate, infernal transformation allows him to transform into a powerful unit with increased attack damage, movement speed, and damage reduction. Each time he kills an enemy hero, he gets more of those bonus and longer transformation duration. Think of Sven's God's Strength. Who dares to fight him in this condition? Luckily he is slow and kitable, but Hirokuza under ultimate's effect is very fast even faster than most other hero. He can chase any enemy safely and get kill easily. You can't just ignore him until his other allies die like you do to Bristleback. Not to mention his passive, unstoppable grants chance to dispel debuff he receives while slowing and damaging enemy units nearby. It literally makes him unstoppable.

Since the duration of his ultimate is quite short and it's cooldown is quite long, he has to use it at the right time. And he has to amass much gold and levels because if he's killed under ultimate's effect, his ultimate's bonuses will be granted to his killer. I think the most fun part of playing with and against him is that his ultimate's crazy effect can be transferred endlessly from him to his enemy, to his ally, to his enemy again, and so on. While the bonuses are getting stronger each time the affected hero kills his enemy hero. It might be hard to kill the transformed hero, but it's also very rewarding. By doing that, the killer's team turns the terror back to the killed hero's team. Then the killed hero's team will try to take the ultimate back, and so on.

Hirokuza's basic abilities becomes stronger when used under his ultimate's effect. Marked for death can be used to ensure a kill. It's bonus synergies well with ultimate. It's self debuff can be dispelled by unstoppable. Fly can be used strategically to keep enemies from attacking his allies or to prolong ultimate's duration and lands when a kill is already guaranteed. It's self debuffs can also be dispelled by unstoppable (Hirokuza is very lucky if it happens). Keep in mind that prolonging ultimate's duration gives enemy team chance to kill hirokuza in transformed form. Marked for death and fly can be used to trigger unstoppable to dispel another debuff he already has.

Hirokuza's weakness are his basic abilities are relatively weak without ultimate. They're just not very good for farming. He needs to constantly get kills by ganking. It's very dangerous if he's left behind. Without enough items and levels, he won't even dare to transform. Before teamfight happens, he shouldn't be taken down first before he uses his ultimate. It's very bad even if he doesn't die. Fly can be used to prevent this to be happened.

PROS Very strong ultimate. Discourages enemies to target him first. Forces enemies to target him first. Good ganker. Good snowball potential.

CONS Gives enemy great advantage when killed under ultimate's effect. Low intelligence and intelligence gain. No reliable disable and escape. Slow farmer. Very bad if left behind.

The best way to build Hizokuza is to make him a durable carry. Item build:

Starting items: Tango Stout Shield Iron Branch x2 Healing Salve

Early game: Quelling Blade Boots of Speed Magic Stick

Mid game: Power Treads Magic Wand Mask of Madness Vanguard

Late game: Crimson Guard Satanic Manta Style

These are some item that has interesting synergies with him:

Town Portal Scroll
Can be used while flying, a guaranteed teleport.

Blade Mail
Good for a tank. Discourages enemies from attacking him for 4 seconds so that he has better chance to cast fly.

Vanguard and Crimson Guard
Reduce damage taken even more. Make him more unkillable under ultimate's effect.

Heart of Tarrasque
Becoming unkillable under ultimate's effect. Upon succesfully cast fly after being damaged, he can regen a lot of health safely.

Radiance and Octarine Core
Burn enemies while flying while also regenerating health. Octarine passive bonuses are all very useful too.

Manta Style
Extra dispel, extra movement speed, extra stats, and 2 transfomed illusions, flying or walking.

Etc.