Ness (SSB)/Back aerial
Ness does a quick split kick with his feet in front of him in the air, doing 16% (12/13 percent for "weak" hit) for remarkably high knockback with high shield stun but with a smaller hitbox than most of his other aerials. This move is Ness's most powerful aerial, in terms of knockback (outside of Up Aerial in the Japanese version.) Unlike most of Ness's aerials, this move is not as strong for juggling purposes, due to it's higher knockback and slightly greater ending lag. It is possible to combine this move with the double jump cancel technique, though this is more used for pressure, KO potential, and grab setups than combo setups. The most common use of this technique is out of a up tilt or up aerial for KO knockback. The sour spot hit of his back aerial, being at the absolute edge of his feet, has low combo and knockback potential due to it's awkward hitbox/angle so it is uncommonly used on purpose outside of a weak b-air to down aerial spike at mid percents. The weak hit also has low shield stun, making shield breaks uncommon.
This move, along with Ness's other moves used for DJCing, has short range, so the technique has since lost recognition and known effectiveness.
Even though it is Ness's slowest aerials, it still has shield break potential due to it's incredible shield stun. However, unlike his other aerials, this only occurs if done right next to an opponent (to prevent the sour-spot) and it cannot be used alone (as in other aerials must be used after the initial b-air) due to it's range being sub-par and due to it's ending lag being noticeably higher than Ness's other aerials (along with the previously mentioned low shield stun.) This makes it the less commonly used aerial for Ness mains along with neutral air outside of high percents. This is also since his weak hitbox is considered to be borderline useless and is quite easy to hit with as Ness concentrates on spacing.