Io/Counters

Bad against...

 * During a gank, Bloodseeker will often kill Io first and steal its health.


 * Bristleback is almost impossible to take down with a Relocate gank.


 * With, Clinkz will nearly always kill Io, even if he Tethers away.


 * will often counter.


 * often saves a hero from Io's team gank.


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Others

 * In general, heroes that resistant to ganking will do well against Io.
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Items

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Good against...

 * Nature's Prophet is extremely easy to gank with Relocate while he's split pushing.


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Others

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Works well with...

 * can bring an enemy into the Tether slow.
 * can stun the enemy long enough to finish them.


 * causes Io to heal Juggernaut for an extra 1.5 times the amount Io is being healed due to Tether.
 * When Juggernaut uses, Io's Tether will persist, allowing for an easy team wide slow due to Juggernaut jumping between the enemy team. This is especially effective if Juggernaut has.


 * 's heal is very powerful when combined with Tether.
 * 's can be used to pick off lone enemies using.
 * 's will increase the damage done during Duel and also reduce the damage taken during it.


 * With, Io can Relocate two heroes at the same time (three if Lifestealer has ).


 * 's jump will usually trigger Tether's slow.
 * makes Phantom Assassin more durable and allows her to get more hits in.


 * becomes more powerful with higher movement speed, and benefits from 's sattack speed increase greatly.


 * Sven's mobility is greatly improved by Tether.
 * and will take down an enemy in no time.
 * Mana regeneration from Io's items benefits Sven greatly.


 * Tiny's burst damage with and  is ideal for finishing off enemies quickly.
 * Tiny can also Io if the enemy gets away.


 * Ursa's mobility is greatly improved by Tether.
 * will allow Ursa to dish out heavy damage with.

Others

 * In general, heroes that can stun and beat down an opponent quickly will work well with Io.
 * Heroes that provide vision help Io pick ideal places to Relocate:, ,.
 * It is possible to Relocate Techies in range for.
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List of heroes that counter Io, and list of heroes that work well with Io.