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Behind Sasuke and Naruto, Shino is the strongest of the Nine Leaf Rookies from Hidden Leaf, yet, oddly enough, remains quite stoic and impassive. He talks only unless he absolutely has to, and not because of lack of intelligence. Rather, he is quick to pinpoint advantage's and weakness's when he fights. Not quite on Nara Shikamaru's, but closer than the other rookies.

From birth, people of the Aburame clan make a pact with an insect known as Destruction Bugs. In exchange for a lifetime of chakra which the insect's use for food, the host in which the bugs live in can call upon their service whenever they need to. Shino is no different, and has thousands of the insects living inside him. Aburame Shino utilizes the insects by having them sneak attack his enemy, while he distracts them with simple taijutsu. He could also have a clone of himself performed when in danger, or use a female bug as a tracking device hunting down fleeing pursuers.

Shino's first documented fight against Zaku Abumi demonstrates Shino's cool demeanor and strength, as well as his ability to think ahead of his opponent. After the fight, many people, including Naruto and Hyuuga Neji were impressed, but still, much remains unknown about him.©naruto-kun.com

Not much is known about Chomaru, except that he's Chouji's father. And his former teammates are Chouji's current teammates' fathers. They used to call themselves the 'ino-shika-cho' trio. Altough we haven't seen Chomaru's true power, he seems to posses a great deal of it. Just like Chouji he uses body enlargement jutsu, but at a much stronger level.©naruto-kun.com

The big-boned Chouji is a pupil of Asuma and a teammate of Shikamaru and Ino. Chouji spends most of his time eating, thinking about eating, and resting. He has pretty funny jutsu like the meat tank, where he triples his size and transforms himself into a huge spinning ball. And then uses his chakra to roll the ball in all directions.

He isn't really motivated to fight or do anything for that matter. The only way to get him to fight or help is to reward him with food. But when people call him chubby,fatty(...etc.) / mocking his weight he gets pissed off, and won't hold back. Since he's part of the Akimichi Clan who specializes in body enlargement jutsu he can also use the clan's food pills to increase his power tremendously, but putting a heavy strain on the body. Chouji is someone who is, but mustn't be under estimated.

©naruto-kun.com

Dan was a Hidden Leaf Jounin, and Shizune's uncle. He always dreamed of becoming Hokage after his little sister died. He cared for everyone in his village, and wanted to protect all of them. He met Tsunade at a jounin meeting where Tsunade did her proposal to assign a medical ninja to each squad. Tsunade said it should be the Leaf's number one priority to efficiently train highly skilled medical ninja, develop a medical organization, and establish a solid strcuture for it. But because the Leaf was at war, the Third stated there was little time, they lacked the knowledge to do so, and the enemy wasn't going to wait for them. Tsunade became angry at the Third, and the only one that spoke out in favour of Tsunade at that point was Dan. Dan said he agreed with her idea and they should learn something from the past, and not let the sacrifice of the Leaf's fallen ninjas go to waste.
©naruto-kun.com

Both of them had a younger sibling that died in a raid on Konoha. And they both didn't want anyone else that was close to them to die anymore. Dan and Tsunade fell in love. And as a gift and a sign of luck, Tsunade gave him her necklace. The necklace that once belonged to her grandfather, and the same necklace she gave to her little brother Nawaki right before he died.

But just like her younger brother, Dan died the day after receiving it. He was seriously injured in battle. Tsunade did everything she could to save Dan, but his wounds were too severe. Dan died on the battlefield, where his last words to Tsunade were that he wasn't ready to die yet, and he still had a lot of things to do. Tsunade, now having lost two people that are important to her, changed completely. She became afraid of blood, and left Konoha along with Shizune. Later on Orochimaru tried to convince Tsunade to heal his arms by bringing Dan and Nawaki back to life in exchange. A proposal which Tsunade ultimately refuses.©naruto-kun.com