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If its sports anime/manga, i would go with slam dunk and eyeshield 21. Eyeshield's anime never finished, but the manga did. And the anime is still superb. Then i'll go with fma brotherhood, death note and one piece (not yet concluded but i could rewatched from start everytime s new arc emerged). Honourable mention is baka to test shoukanjuu. Its also not concluded.. And great teacher onizuka