Hi Guys, hope someone may help me out!
Ok, so the game that I am trying to remember was for PS1. You had a party consisting of 4 people, each of whom you could control separately. I clearly remember the players of the said party:
1) A young guy, with brown hair, all spiked up. He was the 'main-character' as you would start the game with him.
2) Young blonde girl (sorry, the only fact in my memory)
3) Child girl, with blonde hair and orange outfit. Further in the game you would discover that she was actually a robot. Her name was Rachel.
4) A big, muscly guy ("Tank type"), also with blonde hair(may be brown).
I also recall that each of these guys would have their own fighting style; for instance Rachel had a very flexible-type of fighting style, punching and kicking while moving like a gymnast. The "tank" guy was sort of a brute, fighting with fists etc. Main guy was able to use guns.
The game was non-linear(You still had to get from point A to B to progress), as you could explore certain rooms, floors etc. You also encountered many cut-scenes, different boss fights, items etc. The game also had a mini map in one of the corners.
Regarding the boss fights, I clearly remember one of them: A young woman(probably was a scientist wearing white coat), hair dyed in purple, with pink claws protruding form her hands.
One last thing: The name of the game was a sort of abbreviation, consisting of 4 letters separated by dots.
Thank you very much for the attention, hope someone can help me out!