Riki/Counters

Bad against...

 * Axe has a very high HP pool, making it hard for you to kill him before you get big items - that is if you survive engaging him. Counter Helix ignores your armor and goes straight for your tiny HP pool, taking large chunks of it each time Axe spins; the cherry on top is Berserker's Call, which forces you to attack Axe without cover.


 * Zeus' ability Lightning Bolt and least necessary Thundergod's Wrath provides short duration of True Sight, exposing Riki from being invisible.


 * While Sven posses little to no risk to Riki by himself, he can be a nightmare to fight when his allies are close. Svens Warcry gives you a harder time killing either Sven or his supports, and if he is given True Sight over you, he can make quick work of you with his enormous damage output


 * Riki has little HP and armor on top of the fact that he deals very little damage from up front, so it's no surprise you will almost always lose a Duel as Riki unless you have allies covering for you. Even later in the game once you farm up your items Legion still poses a great threat so it's best to avoid engagements with her unless you know she cannot use Duel on you.


 * Chronosphere will make Riki appear, and given your low HP and Void's high damage output he will most likely kill you before Chronosphere ends.


 * Unstable Current applies a heavy slow each time you will cast Blink Strike, so you can't really chase him with it unless you use Black King Bar.
 * Static Link drains away your damage, leaving you only with the one from Cloak And Dagger while Razor ends up hitting like a truck, forcing a retreat if you decided to engage him alone. Furthermore, Static Link will reveal your location for its duration, even when you are invisible, which ends up being pretty bad for you if his allies appear with detection.

Items

 * Gem of True Sight is a nightmare for Riki if not agile.
 * Sentry Wards, traditionally used to maintain sight of invisible units.
 * For emergency use, Dust of Appearance is capable bringing down Riki for awhile for True Sight vision.
 * Silver Edge nullifies Cloak And Dagger, taking away half of your damage and your invisibility, making Tricks Of The Trade halfway useless in the process
 * Necronomicon 3 can reveals Riki in war so his purged out is useless.

Good against...

 * Chen is basically your natural prey: he has little HP, low armor and relies on his persuaded creeps to fight, which in most situations will not save Chen from you. Just be wary of Centaur Conquerors, who can stun you outside of Smoke Screen and ruin your attempt at Chens life.


 * Smoke Screen prevents the use of Tempest double and Flux, and Blink Strike gets you close enough to Arc Warden to negate the evasion effect of Magnetic Field. Be wary of Flux though, as you will most likely be alone when searching for kills, which is exactly what Flux would require.


 * Sniper has no natural escape and relies on his range and slows to keep himself safe, which you can bypass with Blink Strike and quickly deplete his miniature HP pool.
 * Most Sniper players will build Shadow Blade as a mean of escape, but you can easily counter it with Dust of Appearance, further securing your kill.


 * Riki's Smoke Screen effectively disables all Crystal Maiden's spell - including channelling Freezing Field, making easy target to kill.
 * Due to her low stats of health and armor in most phase, Riki can finish her off easily.


 * Riki can give Bounty Hunter a very hard time tracking him down, as Riki has a more or less permament invisibility so he doesn't have to ever give out his location. On top of that, Riki can purge himself with Diffusal Blade and jump away with Blink Strike without breaking invisibility.


 * Smokescreen interrupt Meepo from casting Poof or Earthbind.
 * Trick of the trade can damage all Meepo.

Works well with...

 * They simply use their ulties together: Riki uses Tricks Of The Trade and Void Chronoes the affected area. If you happen to be playing against a moron, Void doesn't even have to be on your side: it's not unheard of a Faceless Void dooming his own team with his Chronosphere. Just time it correctly so the said situation doesn't happen when you are allies with one


 * Lifestealer can Infest Riki for one mean Naix bomb. If the enemies end up getting detection, you can use the same strategy to give them one hell of a surprise.


 * Earthbind or Geostrike can keep enemies in the area of Smoke Screen or Trick Of The Trade longer.


 * Ion Shell on Riki is like having an invisible Radiance which will greatly annoy the lane, especially against double melee lanes.

List of heroes that counter Riki, and list of heroes that work well with Riki.