Jigglypuff (SSB4)/Back aerial
Jigglypuff performs a backwards spinning kick, extending out its foot while doing so. It deals 13% damage, and is Jigglypuff's strongest aerial, being able to kill before 100% offstage, and from around 100% onstage. It is not disjointed and has a hurtbox throughout its hitbox.
The move is considered one of Jigglypuff's better aerial moves, despite lacking the notorious combo potential it had in Melee. Being Jigglypuff's strongest aerial, it is often one of its best options for killing due to Jigglypuff generally struggling to get KOs. It is also Jigglypuff's longest ranged aerial, and one of its longest ranged attacks overall, making it a valuable spacing tool, something which Jigglypuff has a notable lack of. Due to the move dealing relatively high damage in one hit, and Jigglypuff's high aerial mobility, it is also generally safe on shields, and its range and power makes it a deadly edgeguarding tool.
However the move also has three noteworthy flaws. Firstly, it is Jigglypuff's slowest aerial in terms of startup, limiting its spacing and edgeguarding potential, as well as removing most of the combo potential it had in previous games. Secondly, while it is one of Jigglypuff's longest ranged moves, it still has the typical lack of reach that Jigglypuff's moveset in general suffers from. In addition, it has noticeably less range than it had in Melee, again limiting its spacing and edgeguarding potential. Finally, while it does have powerful KO potential offstage, it does not kill until high percents onstage, which given that its characteristics result in it being almost exclusively a kill move.
Overall, the move is a very valuable asset to Jigglypuff, with its decent range, strong edgeguarding capabilities and kill potential.