Oooooooh. I have a few, if that counts? A lot of nostalgia in my choice of favourites, though.
Okay so - Eureka Seven, because it stole my heart as a child. I absolutely loved the awkward, goofy slow-burn romance. Inuyasha was another favourite - when I was still in the single digits I used to watch the two mentioned one after the other on late night at my grandma's on YTV's "after dark" selections. Sailor Moon was another one - more typical of a young girl in the early 2000s. As an adult I was introduced to Mirai Nikki/Future Diary and I've absolutely adored it since I was introduced to it.