the first Question is:

I am one of the many successful character in the 3-d gaming universe. People consider me as an "icon". But hasn't always been good to me. Once i was helping a colleague of mine who was apparently trapped in a logo.As he was recovering, i told him what was going on but due to my gibberish talk, he didn't understand what i was saying so he took out a weapon and destroyed the logo. Later i was destroyed by his weapon.Who am i?
The answer is Banjo-Kazooie

The winner is: Xannidel

the second question is:

I am the sidekick to the son of the one who changed the gaming industry.I am a buddy as my partner liked to call me. One day, My best friend put me in charge to guard an important items.Unfortunately i was ambush by the enemy and imprisoned in a containment. Then my friend found me and the adventure had just begun.Who am i.
the anwser is Diddy Kong

the third question is:

My game was consider the best of all games in the console i was put in.They made four games about my tales.I was introduce as a nice character but the years has been hard on me and my life changed dramatically.Now i am consider "hey you"(apparently they don't bother learning what my name is),"Greedy Bastard" and "little twat". Who am i,you forum chaps?

The Answer is Conker The Squirrel
Four Games are Diddy Kong Racing,Conker pocket tales,Conker Bad Fur Day and Conkers: live and Reloaded
and for the names if one remembers the money says "Hey you" and also calls you "greedy bastard" and you know the poo calls "little twat"

the fourth Riddle is: I am a sole hero in a corrupted Universe. I stand out alone as a saver.I eliminate my enemies and take my spoils of war. I was design to solely protect my universe at any cost. Currently i'm trying to stop this evil scientist from doing any more damages to the civilians but he always escape from my gaddman grasp.But i learn from my mistake cause im always making mistake in the beginning until i start learning.Who am I?

The Answer is Megaman
Spoils of war is taking something from the enemy when you finish him or her(i hope this the right definition)
Currupted Universe as in Robot Land and there is like two humans in the world(and maybe that girl but i don't know if she is human)
The whole dying in the beginning is what most people do unless they are hardcore players or they learn from what there doing.
The evil basterd is dr.wily and he always escape cause it was a decoy or making a distraction

the fifth riddle is:
We started out as just a random specimen you get on the way on your journey. Sure We were awesome but in the begganing the company didn't thought the game was gonna be popular as accepted. Now because of us ,The game is extremely popular among youth and adult.We are what defines the Franchise Popularity.Who am and who are my other buddies?
Answer :Why it is the whole Pokemon Roster
cause there is more than one Pokemon that made them happy and if one remembers, nobody accepted Pokemon to be popular as it is today. What define the franchise is the Pokemon himself