Shino Aburame is a calm, collected, and solitary person, who is quite mysterious. He is portrayed as being somewhere between merely stoic and matter - of - fact, rarely ever smiling or showing emotion at all; rather than thank his team-mates for congratulating him on his victory in the preliminaries, he told them that he expected them to do the same (both Kiba and Hinata lost their matches). He also has a tendency of holding grudges and being rather intimidating, such as seen when Naruto failed to recognize him at the start of Part II, but easily recognized Kiba and Hinata. He still holds that grudge to this day.
Shino seems to be aware of these odd personality traits; in the anime, when he ate food poisoned with a chemical that forced him to laugh, he menacingly told Naruto to forget it had ever happened. His interest in bugs only helps him strengthen this viewpoint; by spending most of his spare time watching bugs, and often making analogies to bugs when talking, people have come to identify Shino as "creepy", and tend to dislike being in his company for prolonged periods of time.
Despite occasionally arguing with Kiba, Shino has a very strong sense of connection with his team-mates and allies, first seen when he regretted being unavailable and therefore unable to help with retrieving Sasuke Uchiha. From that point onwards, he resolved to work on his teamwork skills with Kiba and Hinata. He even helped Hinata to improve her abilities, and is one of the few people, besides Naruto, who openly professes confidence in her. The fruits of his efforts are seen in the anime, where Shino was able to carry out a mission successfully while also keeping others safe. He also proves to be able to understand his team-mates' inner workings, sensing when the slightest of things is wrong with either of them.
Shino speaks in a curious fashion, as noted by both Naruto and Kiba; a rudimentary explanation of his syntax is that he will ask a question before explaining a point, where as most people will leave the question unspoken. Also, he tends to restate facts in a more technically correct fashion.
In the anime, it was shown that Shino will panic when confronted with insectivorous animals or plants. He will also fall into despair to the point where he almost cries and even refuses to continue his mission to avoid losing any more insects.
Shino has dark bushy brown hair, pale skin, and was the tallest ninja of his graduating class. Shino is regularly seen sporting the same style as the rest of his clan, consisting of dark sunglasses and a sea-green jacket with a high, upturned collar. During Part II, his appearance became even more mysterious, with his jacket hanging down to his knees and the addition of a hood that obstructs his face even more and a satchel on his back. This current appearance makes it harder for people like Naruto to recognize him right away. During the Fourth Great Shinobi World War, he wears a flack jacket under his jacket.
In battle, Shino is able to take great use of his intelligence, being able to use his analytical and observational skills to make shrewd judgments with pinpoint reasoning. Like Shikamaru Nara, Shino prevails in battles by systematically staying several steps ahead of the enemy, as well as keeping a good distance away to avoid enemy attacks. Because of this, Shino is fairly confident in his abilities and that he will win a battle, and tends to try to communicate this to an opponent for their own well-being. Still, Shino enjoys fighting, and dislikes being denied a chance to battle a skilled opponent, as seen when he went out of his way during the invasion of Konoha to fight Kankurō, after the latter had forfeited to avoid revealing his puppets' secrets.
Shino and the insects inside him.As a member of the Aburame clan, Shino was infused at birth with a special breed of insects, called kikaichū, that feed on chakra, usually his own. In return, the insects attack, and do other tasks as he commands. In battle, he relies heavily on boxing an opponent in with his bugs and then consuming their chakra once they cannot escape.
Shino has found a number of other uses for these bugs, and as such has devised a number of jutsu that utilize them for various purposes. The first of these jutsu that was seen is his Insect Clone Technique, which uses the bugs to create a copy of himself, that is able to reform once struck. He can also use Insect Jar Technique to create a protective wall of insects to shield himself. Shino could also use the bugs to spy and gather information.
A female bug can be left on a target, which then can be tracked by its scent by the male bug, or scout bugs can be sent out and return to tell the host information about the area. Shino can communicate with the bugs, and the bugs specialize in stealth because they make no noise or motion during combat, making Shino highly adept in espionage.
Additionally, as seen in the anime, it was demonstrated that the bugs are always undergoing evolutionary adaptation through mutation and natural selection. While the kikaichū only have a lifespan of a few hours, their life-cycle ensures that there will always be females with eggs. Any variations that prove useful to the individual bug (and consequently the bug-user) in combat will be passed on to the next generation, which can then be used cultivated for their success against dangerous opponents in combat.