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I'm still relatively new to anime. In order of what I liked the most,
1. Fate Stay Night
2. Code Geass and Sword Art Online
3. Guilty Crown
4. Accel World
I looked through the suggestions. I should have been clearer; I really want the element of romance to lighten things up, but I'm not looking for a romantic comedy. I searched up the suggestions and not many of them had much romance.

In order of preference:
1. Action-oriented plot with a clear final goal.
2. Relatively darker plot with lightening segments such as (but not limited to) romance, where romance is not central to the plot, but is still a key element. (So preferably not a romantic comedy, unless it's really good)
3. Good art
4. Good music
Thanks in advance!