In Grand Theft Auto IV there are a lot of hit missions and Niko by far has been the protagonist to have killed the most characters in the entire Grand Theft Auto series. Here is a list of his ordered murders (not just all the guards):
- Dardan Petrela- The first murder by Niko in Liberty City. He stabs him and throws him out of the window for trying to kill Roman Bellic.
- Vladimir Glebov- He shoots him in the head for sleeping with Mallorie Bardas behind Roman's back.
- Lenny Petrovic- Killed on orders of Mikhail Faustin.
- Jason Michaels- Killed on Faustin's order for messing around with Faustin's daughter.
- Lyle Rivas- Chased and killed on orders of Brucie.
- Tom Rivas- Killed on orders of Brucie (optional, you do not have to do this mission).
- Mikhail Faustin- Killed on orders of Dimitri Rascalov and to help himself out of trouble with Kenny Petrovic.
- Tom Rivas- Killed for not paying off his debt to Brucie.
- Jayvon Simson- Kills him for not paying back Dwayne Forge (optional, you do not have to do this mission).
- Marlon Bridges- Killed on Playboy X's orders.
- Trunchez Brothers- Killed so Dwayne Forge can get the Triangle Club back (optional, you do not have to do this mission).
- Teddy Benavidez- Killed for owing Ray Boccino money. To execute him, you can throw a grenade or molotov and he falls out of the building whilst on fire. However, the player can corner him and shoot him with a gun
- Kim Young-Guk- Killed on Jon Gravelli's orders.
- Aiden O'Malley- Killed for trying to get back at Derrick McReary.
- Bucky Sligo- Killed for trying to get back at Derrick McReary.
- Tony Black- Killed and framed the murder on the Albanians so their relationship with the Ancellotis could be damaged.
- Frank Garone- Killed and framed for the murder of the Albanians.
- Jim Fitzgerald- Killed on Ray Boccino's orders.
- Isaac Roth- Killed for threatening Ray Boccino.
- Luca Silvestri- Killed for stealing the diamonds.
- Joseph DiLeo- Killed in a shootout with Niko Bellic.
- John Barbosa- Killed in a shootout with Niko Bellic.
- Ray Boccino-Killed on Pegorino's orders.
- Anthony Corrado- Killed for attempting to rat out Jimmy Pegorino.
- Dimitri Rasalov- Killed for trying to kill Niko.
- Jimmy Pegorino- Killed for killing Kate, only if you choose the Revenge missions.
- Eddie Low- Killed by Niko when he attempts to stab and kill Niko (Eddie Low is a random character so killing him or even encountering him in the first place is optional).
- Ivan Bytchkov- Niko can throw him down the building on Vlad's order or help him up.
- Mickey- Can be killed during Uncle Vlad.
- Cherise Glover- Niko can shoot her in Ruff Rider.
- Clarence Little- Niko can kill him on Francis McReary's orders or you can let him live.
- Alonso Gomez and Oscar Gomez- you can kill them or let them warn Teddy.
- Darko Brevic- Niko can either take revenge by shooting him multiple times or sparing him.
- Sergei-In Deal Sergei attempts to kill Niko,but kills Roman instead and Niko kills him in revenge.
Kill One Or The Other
- Playboy X or Dwayne Forge- Niko shoots Playboy under the jaw and obtains his penthouse or Niko can shoot Dwayne in the back of the head.