Akatsuki (暁,meaning "Dawn" or "Daybreak")

Appearance:
Clothing - Akatsuki members dress in similar clothing: a long, dark cloak bearing red clouds and a red interior with a chin-high collar. All members also wear nail polish of varying colors on their fingernails and toenails. When starting a mission they wear large conical straw hats with small spike-like bells hanging from them to block their faces, but the hats are discarded once they have been discovered.
The rings - Each Akatsuki member wears a single, unique ring, and no two members wear a ring on the same finger. In total, there are ten rings, and each seems to have some special significance.Each ring bears a unique symbol, the first kanji of its name.

The various rings are:
Right thumb: 零 rei, "zero"; worn by Pain.
Right index finger: 青龍 Seiryū, the Azure Dragon; worn by Deidara.
Right middle finger: 白虎 Byakko, the White Tiger; worn by Konan.
Right ring finger: 朱雀 Suzaku, the Vermilion Bird; worn by Itachi Uchiha.
Right little finger: 玄武 Genbu, the Black Tortoise; worn by Zetsu.
Left little finger: 空陳 Kūchin, the Void; formerly worn by Orochimaru.
Left ring finger: 南斗 Nanju, Sagittarius (lit. Southern Star); worn by Kisame Hoshigaki.
Left middle finger: 北斗 Hokuto, the Big Dipper (lit. Northern Star); worn by Kakuzu.
Left index finger: 三台 santai, "three levels"; worn by Hidan.
Left thumb: 玉女 gyokunyo, the Virgin; currently worn by Tobi, formerly worn by Sasori

Tobi
Ring: 玉 ("jewel", "ball"; "jade"; also the king in shogi)
Ring position: Left thumb
Partner: Formerly Deidara
A former subordinate of Zetsu. After Sasori's death, Tobi takes his ring, position, and partner (Deidara) in Akatsuki, thereby becoming a full member. Tobi's personality is at odds with the standard amongst Akatsuki members; while most are dedicated and serious, Tobi is more carefree and goofy. These personality traits tend to irritate Deidara, who often attacks Tobi in a comical fashion whenever Tobi unintentionally annoys him. Kisame Hoshigaki, on the other hand, appreciates Tobi's ability to brighten up their "gloomy organization".

After Deidara's suicidal final attack against Sasuke, which Zetsu speculates might have also killed his partner, Tobi is shown to be alive and giving orders to Pain, until then the ostensible leader of Akatsuki. During their conversation, he refers to himself as having the power of Madara Uchiha. As Madara, Tobi's personality and speech become completely different, with much less formal diction and a more typically 'villainous' arrogance. It seems, however, that he still has some vested interest in maintaining the illusion of himself as the carefree Tobi, as he reverts to this personality upon encountering a group of Konoha ninja.

Tobi's actual appearance remains a complete mystery, except for a wild shock of black hair. He wears an odd mask that covers his entire face save for his right eye, which like other Uchiha has a Sharingan. He also has several bolts or pins present on the arms of his uniform, now obscured by his Akatsuki cloak. Furthermore, Tobi does not wear a visible headband, though Madara Uchiha is known to originate from Konohagakure. His fighting style is equally shrouded in mystery, as his only notable trait is the ability to let attacks pass through him.