Oh, School Rumble? Nice. Well here's a few: Inu x Boku, Secret Service, Say 'I l’amour You', My Little Monster, Lovely Complex, My Ordinary Life/Nichijou, Lucky Star, Acchi Kocchi, Senyu, Karin chibi Vampire, Kamisama Hajimemashita,Usagi Drop, Anohana, Ano Natsu de Matteru, Ouran Highschool Host Club, Kids on the Slope, GJ club, Angel Beats, YUYUSHIKI, My Teen Romantic Comedy SNAFU (yeah I know it sounds cheesy) , Sakurasou no Pet na Kanojo, Kimi Ni Todoke, Toradora, World Only God Knows, Tsuritama, SKET Dance (reminds me of School Rumble). Okay, I'll stop there, I may have gone a bit overboard..
Ouran High School Host Club Fruits Basket Chobits Ah! My Goddess Negima!? Baka and Test Rosario + Vampire Tsukuyomi: Moon Phase Powerpuff Girls Z Girls Bravo My Bride is a Mermaid B Gata H Kei: Yamada's First Time
Based on "Inuyasha" I suggest: *Ranma 1/2. *Ruroni Kenshin. *Himiko Den. *Kyou Kara Maou. *Urusei Yastura. *Mermaid Saga. *Maison Ikkoku. *Fushigi Yuugi. *One-Pound Gospel. *Yu-Yu Hakusho. *Houshin Engi. *Blood Reign: Curse of the Youma.
Based on "Sailor Moon" I recommend: *Wedding Peach. *Magic Knight Rayearth. *Battleskipper. *Magical Girl Pretty Sammy. *Ojamajo Doremi. *Hime-chan's Ribbon. (Same studio). *Goldfish Warning. (Same studio). *Rainbow Brite. *Akazukin Chacha. *Codename wa Sailor V. *Fushigiboshi no Futagohime. *Magical Princess Minky Momo. (There's a 1982 series & a 1991 series). *Creamy Mami. (Had a lot of influence on Sailor Moon). *Magical Fairy Persia. *Mahou no étoile, star Magical Emi. (Had a lot of influence on Sailor Moon). *Devil Hunter Youko (has lots of nudity though). *Nurse Witch Komugi-Chan. *Majical Idol Pastel Yuumi. *Puella Magi Madoka Magica. (Refreshingly violent for a magical girls series). *Project A-Ko (It's ecchi, but it's girl power).
If toi want to relive the Kagome-Inuyasha relationship, there's the entire "Full Metal Panic" franchise.
Fun fact: Sesshoumaru bears a striking resemblance to Youko Kurama from Yu Yu Hakusho, which was a series created par the husband of the woman whom created Sailor Moon.