[Divini]

1. BlackRose/Rena from the .hack// series
Ku Fei and Princess Theodora from Mahou Sensei Negima

2. Seto no Hanayome

3. Sheryl Nome does this to the protagonist in Macross Frontier... a lot.
Smilarily, Chou'un and Sousou does this to Kan'u in Koihime Musou whenever a good chance pops up..

4. Miu from History's Strongest Disciple Kenichi

5. Anything between Key and KyoAni, like Clannad or Kanon
Also True Tears

6. San and Lunar from Seto no Hanayome, again.

Tira and Chocolat from Sorcerer Hunters

Minato and Yuuhi from Akane-iro ni somaru saka - though Minato sort of falls under the 'timid' type.

Kaname and Tessa from Full Metal Panic!, though they don't tease each other too much

Sheryl and Ranka from Macross Frontier
(In fact pretty much a requirement for any Macross series. Though one of the two usually starts off as shy, that person gains a lot of confidence as the series goes on.)

Kei and Miyako from ef - a tale of memories, though this is played pretty seriously.

All the girls in Goshuusou-sama Ninomiya-kun

Again, almost every girl in Ranma 1/2