Who do you think the leader in each squad is?

[Fair Warning]

During the chuunin exams, Sasuke showed he was the leader. Sasuke made all the strategies and the others followed it.

As for the other teams.

Team Gai: Neji
Team Kurenai: Kiba. Shino is stronger and smarter, but too silent and doesn't take charge.
Team Asuma: Shikamaru is the smartest, but Ino seems to take charge often as well. I'd say its 70/30 Shikamaru/Ino.

^ This guy gets it. Thank you