Falco (SSBM)/Up tilt
Falco flips his leg behind himself. The hitboxes initiate very quickly into the animation, and can easily juggle and inflict heavy damage upon heavyweights or fastfallers, and has incredible combo ability - knocking opponents into the air with low base knockback, it can easily followup with an aerial or a shine combo. It can lead into a back aerial to set up an edgeguard, a down aerial for a KO, etc. It is also able to setup situational forward smashes, particularly on fastfallers. The move also has surprisingly high range behind Falco, being a useful spacing tool to punish approaches with surprisingly far reach from the rear hitboxes. It has decent knockback scaling, though isn't a reliable KO move until very high percents.