Mii Brawler (SSBU)/Forward smash
Mii Brawler puts their entire body into a forward punch. Forward smash is one of Mii Brawler's most powerful moves, the uncharged version KOing as early as 60% on cornered opponents - as well as their slowest normal attack. In addition, forward smash can be used as a kill confirm out of a landing neutral air around 60% or landing up air (the latter requires the smash attack be angled upwards). It's also a viable tool for reading an opponent's option, though the minimal active frames of forward smash make it difficult to time. Overall, it is the best move to use on incapacitated opponents, such as those recovering from a shield break or moves with high endlag.