Definitions, from Wikipedia.org
Graphic novel: It suggests a story that has a beginning, middle and end, as opposed to an ongoing series with continuing characters; one that is outside the genres commonly associated with comic books.
List of series for younger teens
Age of Reptiles
Amelia Rules! The Whole World's Crazy Angelic Layer Aria Astro Boy Astro City: Life in the Big City Avatar Baby & Me Babymouse Babysitter's Club Beet the Vandel Buster Beyblade Bone Brain Powered Cardcaptor Sakura City of Light, City of Dark Clan Apis D.N. Angel Days Like This Di Gi Charat Dragon Ball Dragon Ball Z Electric Girl Et Cetera Fashion Kitty Fruits Basket Fullmetal Alchemist GoGirl! Hardy Boys Herobear and the Kid Hikaru No Go Instant Teen Invincible: Family Matters Kamichama Karin Kingdom Hearts Kodocha Sana's Stage Leave it to Chance: Trick or Threat & Other Stories Lenore Little Lit Magic Knight Rayearth Magic Knight Rayearth II Magic Pickle Marmalade Boy Megamen NT warrior Meridian MeruPuri: Marchen Prince Nancy Drew Naruto Owly Pita-Ten Prince of Tennis Saint Tail Sardine in Outer Space Scary Godmother Shaman King Shock Rockets Sidekicks Spyboy Superman for All Seasons Tellos: Kindred Spirits Tellos: Reluctant Heroes The Clouds Above The Land of Sokmunster The Last Knight The Princess and the Frog The Wolves in the Walls Tin Tin To Dance: A Ballerina's Graphic Novel Ultimate Spider-Man Ultra Maniac Whistle Wish WJHC: On the Air! X-Men: Evolution Yotsuba! Yu-Gi-Oh! Yu-Gi-Oh! Duelist Yu-Gi-Oh! Millennium World Zodiac, P.I.