I'm not sure if they showed it in the manga yet but it Gai is stronger when he opens the 7 gate of shock and unleashes Handorum (i do not know how to spell it) and beats Kisame's giant shark bomb so it matters if Gai opens any inner gates with out them Kisame is stronger
Strengthwise... Sakura but all-around, Kisame is way stronger than her
12-15
kisame because orochimaru is dead
Episode 13/14 last time i checked.
Jutsuwise, Kakashi is stronger. However, in strength and amount of chakra, he cannot win. Most likely, though, Kakashi is smarter than Kisame (by far).
The first time Might Guy fights Kisame is in Naruto in episode 82 where Might Guy fends of Kisame from his comrades. Kisame and Itachi quickly leave after Guy's appearance. The second time Guy fights Kisame is in Naruto Shippuden in episodes 250 and 251
Not yet, but however it is highly possible that he will die against Kisame. Opening the seventh gate is already life-threatening, and it wont be enough to defeat Kisame, even if he is weakened. If it comes down to it, Gai will open the eighth gate, too combat Kisame. The results, of course, will be death. It will turn out like how Asuma died, just to give his team some screen time. Although, this is all just speculation.
Physically? no
Neji, Tenten, Lee, and Gai were going to help Kakashi's team and they had to face Kisame. kisame trapped the three chunin in water bubbles and Neji broke them out and tenten was going to faint. To know the rest you HAVE to watch Naruto Shippuden at Naruto.com =)
He might have a brother. Lots of people think his brother is the Mizukage.
Guy does not defeat the real Kisame, but he defeated the duplicate of Kisame that fought Guy. He couldn't have killed the real Kisame because Kisame's leader, Pain, had used the Shapeshifting Technique to make a duplicate of Kisame which was controlled by Kisame.
Might Guy fights Kisame for the second time in "Naruto: Shippuden" Episode 30, titled "The Will of Fire." In this episode, the battle takes place during the "Twelve Guardian Ninja" arc. Guy showcases his impressive abilities in a bid to protect his comrades from Kisame's formidable strength.