actually, there is no cheat-code, but if you have it for PC you can get a trainer and do so..
No
No
No, Kate will finish with Niko if he accepts Deal.
Niko Bellic is voice acted. Niko Bellic is voiced by Michael Hollick.
NO!
No that is only in gta sa
Nope. Just a cop.
No, there is no character customization in GTA 4, so you cannot improve Niko Bellic's strength.
In Niko's final encounter with Jeff, Jeff is a doomed man, Niko cannot save him.
No, Niko Bellic cannot join the LCPD in GTA 4.
Omg, you already are niko. However on online you play as someone else and no you can't play him online.