Bloodseeker/Counters

Bad against...

 * Abaddon's makes him nearly impossible to gank.
 * and prevents Bloodseeker from gaining his Thirst bonuses.


 * prevents Bloodseeker from replenishing his health by finishing off enemies.


 * negates Rupture's damage.
 * prevents Bloodseeker from running down and picking off weak enemies during teamfights.


 * makes it very difficult for Bloodseeker to gain his Thirst bonuses.


 * makes it very hard for Bloodseeker to kill Morphling, or gain his Thirst bonuses.
 * is one of the few movement abilities that ignores Rupture's damage.


 * near invulnerability denies Bloodseeker the bonuses from Thirst, preventing him from gaining the upper hand in teamfights.
 * 's pure damage makes it hard for Bloodseeker to pursue enemies, and prevents him from replenishing his health by finishing off enemies.


 * Storm Spirit is invulnerable during, allowing him to zip away from any ganking attempts with Rupture.
 * also prevents Bloodseeker from chasing down an injured Storm Spirit, or catching him in Blood Rite.


 * will repeatedly stun Bloodseeker in a one-on-one fight.
 * blinds Bloodseeker, causing him to miss 60% of the time, and therefore reduces his ability to gain the upper hand in teamfights.


 * Damage reduction from prevents Bloodseeker from killing targets and gaining his Thirst bonuses.
 * 's area of effect catches Bloodseeker easily, negating his speed bonus during teamfights.
 * allows Underlord to transport any allies who may be ruptured to the fountain, rendering it useless

Others

 * Heroes with high armor and durability can be exceptionally hard for Bloodseeker to bring down: ,
 * Heroes with illusion and clone abilities may confuse Bloodseeker, causing him to waste time in fights:, ,
 * Heroes with area heals prevents Bloodseeker from bringing enemies low, and therefore deny him his Thirst bonuses and health return: ,
 * Heroes with disables that go through spell immunity can end Bloodseeker before he has the chance to do anything: ,

Items

 * will often prevent Bloodseeker's ganking attempts, as he has no disables to interrupt it.
 * can reflect damage from Rupture.
 * prevents Rupture, although Bloodseeker can use Bloodrage first to break the passive.
 * lowers Bloodseeker's damage, making it difficult for his Thirst bonus to kick in.

Good against...

 * Blood Rite prevents Anti-Mage from escaping with.
 * will trigger the damage from Rupture.


 * is not enough to outrun Bloodseeker, and is detected by Thirst.


 * Every Meepo clone adds to Thirst's bonuses.
 * Bloodseeker can chase down retreating clones when Meepo tries to cycle weaker clones away from combat.


 * Thirst detects Riki whenever his health is low.
 * Rupture does large damage when Riki uses.


 * Thirst prevents Slark from healing with.
 * Rupture will deal damage during.


 * Sniper's lack of mobility and escape mechanisms makes him one of the easier heroes for Bloodseeker to gank.


 * Rupture and Blood Rite locks down Timbersaw, preventing him from escaping with.


 * will trigger extra damage from Rupture.
 * 's invisibility is detected by Thirst.


 * triggers the damage from Rupture.

Others

 * Heroes with invisibility will be detected by Thirst:, , , ,
 * Heroes with fast movement abilities will suffer huge damage when afflicted by Rupture.

Works well with...

 * is very helpful when Bloodseeker is ganking, as Rupture discourages the target from moving out of Ice Blast's impact radius.


 * Thirst's speed and detection allows Bloodseeker to efficiently chase down ed foes and claim their bounty.


 * 's initiation increases the bonuses from Thirst.
 * Earthshaker's many stuns help lock down targets for Bloodseeker.


 * Thirst helps Invoker land easy s on low health enemies throughout the game.


 * Thirst helps Nature's Prophet finish off retreating enemies with and.


 * Initiations with and  significantly increases the bonuses from Thirst before a fight.
 * Bloodseeker can also increase Queen of Pain's nuke damage with Bloodrage.


 * compounds damage taken by the enemy and works at any distance, therefore greatly increasing Thirst's bonuses and helps Bloodseeker chase down fleeing targets.


 * Bloodseeker can increase Zeus' damage with Bloodrage, which can greatly lower the enemy's health with before an engagement.
 * Zeus' magical nukes greatly increases the bonus damage from Thirst.

Others

 * Heroes with powerful nukes will quickly increase the bonuses from Thirst:, , , ,
 * Heroes who can move enemies over long distances while ruptured:
 * can  ruptured enemies to their deaths,  can  them,  will  them back,  can  them.

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