Dating these girls is not a requirement to attain the 100% game completion stat, however each has a special ability that is unlocked once they like you enough.
After a couple of successful outings, “try your luck” when dropping the date off and if she accepts you will later get a phone call from her, unlocking the special ability. Her online username is “Law Chick.” Kiki is quite easy to please; she prefers clothes from the Russian shop and downscale cars. Special Ability: Lower Wanted Level - Call Kiki to have her lower your current wanted level by three stars.Since Kate and Michelle are fairly easy to please and only pertain to the storyline, they won't be covered here.There are three other girls that Niko can meet and date via the Do not wear anything from the Russian clothes shop.
As you progress through the story, Niko will be able to wine and dine with a number of Liberty City women.Dating is much like hanging out with friends in that each girl has their own preferable activities.