I wouldn't say I have an anime that's dominant over the others because mine tends change from time to time but I guess my inayopendelewa anime right now is..um Ouran mainly because I've been watching it the most lately.
Without doubt and question, Fullmetal Alchemist, both 2003 and Brotherhood (manga). Regardless, it tells the same story and themes despite the change in direction. I have personal reasons too, but I refuse to say them openly.
The picture depicts Ed and Al fighting. The automail in the picture is Winry and the representation of Ed's strength to be a State Alchemist and the brothers' past. The fighting is something they learned from Izumi and use it to fight the homunculi. Everything that tells its story all in one picture.