lolol well, I do have experience with lolis, but they never appealed to me. They can be annoying at times, even A kind of loli I like is those who just act childish and kawaii, and add cute suffixes at the end of their sentences (Eg. Rika and Satoko from Higurashi). Not really into the "onii-chan, daisuki" kind of loli.
About my favourite type of 2D girl, I'm not even sure I have one. If I have one, it's not one the deres for sure. Tsunderes, yanderes, colderes, they can be funny and cute at times, but repeteadly they get annoying. I kinda used to like them back to the origins, but now I tend to avoid anything that is too highly stereotyped, and dere characters are among what makes an anime\manga\visual novel more stereotyped.
I do like megane though, which is not really about how they act, but how they look. Megane are often cute :3
In the end, I think my favourite kind of characters are probably those moe onee-chans who are like very mild and airhead, who do not even realize how freaking cute they are, and this only makes them even cuter :3 a perfect example is Moe Mizukoshi from Da Capo
Is she not irresistably moe and kawaii?