- Ai Yori Aoshi - Harem, good humor, likable characters
- Shuffle! - Harem, fantasy, comedy
- Ah! My Goddess - similar to Shuffle on the fantasy and romance side
- Love Hina - More of a home than school setting, harem, humor
All of the above I believe fit your criteria of humor, romance, and the silly not so serious side of romance.
Ones previously mentioned that I support for your tastes include Toradora!; Ef, a Tale of Memories; Ef, a Tale of Melodies; Kanon (2006).