For the costumes, i recommended buying King Of Darkness ( cloak ) or Phixus Cloak whatever you want + Frankenstein or Jack O' Lantern. Any costumes set it's fine but i recommended buying set(s) that has +3% phys def power and +5% crit damage ( ex : chibi goth, shinigami outfit, school time safety, fire fighter, Twinkling pajamas, indian outfit ) you don't need to buy 5/5 set only 4/5 ( top, shoes, gloves, hat )