My all time anime is Rainbow. If you dont know it you should start watching!
Elfen Lied is also one of my faves since i started watching animes because of this.
Then there are:
- One Piece (my weekly Anime/Manga) for the next 10 years
- Code Geass/Death Note (very similar)
- Hunter x Hunter
- One Punch Man
- Parasyte
- Many more...