Luigi (SSBU)/Up special
Super Jump Punch is Luigi's most reliable kill move, able to kill around 50% to 60%. It has massive landing lag (45 frames), making it very punishable on whiff. Coming out on frame 8, it is one of Luigi's fastest out of shield options, but hindered by its low range. Super Jump Punch is used as a powerful combo finisher from a variety of Luigi's combo extenders, ending in a stock taken almost all the time. The move does not launch straight up, having an angle of 88° instead. This means that optimal DI is away from Luigi.
In the air, it is noticeably weaker, but can be hit from an up tilt, a down throw and other combos and mix ups. It also has a slightly bigger hitbox that isn't extended into the z-axis, causing some inconsistencies against thinner characters. It is also able to start a combo should Luigi grab the ledge immediately after sweetspotting it. Unlike the grounded version, the aerial version sends straight up, using an angle of 90°.
When sourspotted, Super Jump Punch deals only 1% with knockback so weak that it cannot KO above the upper blast line, allowing two Luigis to perform the Luigi ladder technique. Combined with the high landing lag, this makes the late hit incredibly unsafe to land as it will inevitably lead to a very strong punish.