The characters are Tama, Momo, Wocket, Tiggle, Rockney, Pimmy, Bupkus, Bengpu, and Chopin. There is no consistent plot. Tama and his friends just have little, family friendly, adventures every episode. The only consistency is when a new friend is made one episode and flash backs.
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(Source: Anime News Network)

Episode 1 - Tama and Friends / Tama and the New Student

Episode 2 - Do You Know RibiRibi? / My Favorite

Episode 3 - The Legend of Pochi the Champion / Take It! The Treasure in the Pond

Episode 4 - Chasing After Momo's Bell / Grab That Cloud, Tora!

Episode 5 - The Decisive Battle is in May / The Day Bull Cried

Episode 6 - The Mystery of Matsu's Bathhouse / A Hero Sold

Episode 7 - The Seven Names of Koma / Chased by a Video Camera

Episode 8 - The Labyrinth of Third Street / Two Strays

Episode 9 - Evening at the Department Store / Kuro at Midnight

Episode 10 - So Many Behs / The Legend of Pochi the Genius

Episode 11 - Let's Be Friends / The Dreams of Tails

Episode 12 - Be Brave / Welcome! Takeshi-kun

Episode 13 - Cats Nest Castle Part 1 / Cats Nest Castle Conclusion

Episode 14 - Smile, Tulip / Our Stardust

Episode 15 - Shoot a Goal With Your Tail!! / We are Friends! Tama Ondo

Episode 16 - It's a Penguin!? / Let's Play with Skateboards

Episode 17 - Gon's Errand / Festival Music

Episode 18 - Paradise of Canned Crab

Episode 19 - 3rd Street's Last Day / Dirty-Faced Angel

Episode 20 - The Wandering Collar / The Legend of Devil Pochi

Episode 21 - Goodbye, Tama Robot

Episode 22 - Unruly Paint Battle / Flute's Whisper

Episode 23 - Black Lightning / Chasing the Outing

Episode 24 - It's a Sad Song! Bull's Life / So Cool! Masked Bull

Episode 25 - Make It Clear, Tama! / We Are Not Angels

Episode 26 - Captain Cat ☆ Tama

Aniplex

Group TAC

4Kids Entertainment

TAMA of the 3rd District -Have You Seen My TAMA?