BSS: Before Series Start
a**: After Series Start
(All dates approximate - There is no official comprehensive timeline)

12 Yrs. BSS - Sasuke Born
6 Yrs. BSS - Joins Ninja Academy
4 Yrs. BSS - Witnesses clan massacre
0 - Series Start, Graduates Academy
1 Mo. a** - Activates Sharingan
6 Mo. a** - Enters Chuunin Exam, receives cursed seal from Orochimaru
7 Mo. a** - Learns Chidori. Faces Gaara in Exam final, watches as Naruto defeats Gaara
8 Mo. a** - Learns of Itachi's return, utterly beaten by his brother
9 Mo. a** - Accepts Sound's offer to learn from Orochimaru, leaves Konoha behind. Activates the second level of his cursed seal. Fights Naruto at Valley of the End, but chooses to not kill his teammate.
10 Mo. a** - Leaves Hidden Sound for new hideout with Kabuto and Orochimaru.
3 Yrs. 3 Mo. a** - Meets Naruto and Sakura again, Abandons hideout with Orochimaru and Kabuto.
3 Yrs. 5 Mo. a** - Finishes training under Orochimaru and absorbs him. Fights Deidara. Tracks down Itachi and defeats him in battle. Orochimaru leaves his body.
3 Yrs. 6 Mo. a** - Tracks down the Hachibi Jinchuuriki for Akatsuki.

Ritsu Tainaka (田た井い中なか 律りつ Tainaka Ritsu) is a drummer. She proclaims herself as the president of the light music club.

She has an ambiguous yet upbeat personality, but often has trouble remembering important club activities and announcements, and gets constantly yelled at by Mio after being reminded by Nodoka after forgetting to send in important forms concerning the club. Ritsu is cheerful, often likes making jokes and is sarcastic most of the time. She usually brainstorms for ideas to earn more money and for the club’s success. She first claimed she chose to play the drums because they are “cool”, but in reality, she has trouble playing instruments which involve intricate finger movements, such as the bass, guitar and keyboard, which she later admitted. She has known Mio since elementary school and often teases her whenever she is cowering from something and has the opportunity to do so. Ritsu is always on the go and will stop at nothing for the success of the light music club. Ritsu has shoulder-length brown hair, with her bangs pulled back with a yellow hairband, and gold-colored eyes.

Her surname is taken from former P-Model drummer Sadatoshi Tainaka.
Ritsu sometimes punishes Yui and Azusa with choke holds when they offend her, but she has never done so with Mio or Mugi. She did, however, hit Mugi at one point after an unintentional comment she made (and after the both of them failed at getting someone to hit her at her request). She also once kicked Mio in the shins after Mio tried to stop Mugi and her from taking advantage of Yui and forcing her to join their club.
She is surprisingly good at cooking and hand-knitting (but not with machine sewing).
Ritsu's father owns a pair of pink striped boxer shorts, which he left in stack of shirts on the dining room floor. Oddly enough, this makes him the second character in the series that owns striped underwear.
Ritsu has an admiration for Keith Moon who is the drummer of the English band The Who.
Mio once called Ritsu as Cozy Powell who is a famous English rock drummer.
Ritsu has a little brother, Satoshi, and seems pretty close to him. Apparently, Satoshi enters Ritsu's room frequently that Ritsu had to warn him not to enter her room when she was about to practice for Romeo and Juliet drama with Mio. That time, Satoshi laughed out loud when he heard Ritsu's odd voice when acting as Juliet from outside.
Her drumset is a yellow Yamaha Hipgig,Cocktail and Jr. drumset. It looks quite cool because it is very seldom that you see the cymbals above the bass drum and the floor tom at the left side.
Ritsu received a mining hat once from idling.

Uchiha Sasuke (Sasuke Uchiha in the English anime) is a character in the manga and anime Naruto.

Sasuke, from the day he was born, was driven by pressure and expectations. Born as a member of the prestigious Uchiha clan, most of his childhood was lived in the shadow of his older brother, Itachi. His father seemed to favor Itachi, although his mother confided to him that she always heard him praising Sasuke out of earshot. Even so, the drive to be as good as or even surpassing Itachi caused Sasuke to grow up as a fine young ninja, admired by all the girls around him for his looks, skills and cool attitude. Sasuke’s happiest moment came when he finally mastered the Goukakyuu, a flame-breathing technique. The Uchiha clan’s symbol, a fan (Uchiha is alternate way of spelling Uchiwa, which means fan) represented fanning flames. Mastery of a fire technique by a child was seen as a rite of passage and progression to adulthood.

- Sasuke is named after the legendary ninja Sarutobi Sasuke.
- "Uchiha" is another way of pronouncing "uchiwa", or a paper fan, which is actually the Uchiha clan logo. In ancient Japan, uchiwa were used in court ceremonies, as souvenirs, and to protect soldiers from arrows