1) Beyond enthusiastic 2) Crazed 3) Insane 4) Like many a villain 5) Like some grins 6) Maniac 7) Mass murder in fiction 8) More than crazy 9) Overly zealous 10) Wildly disordered 11) Wildly disordered; crazy 12) Wildly insane Found on https://www.crosswordclues.com/clue/maniacal