Isabelle (SSBU)/Up smash

Hitbox visualization showing Isabelle's up smash.

Overview

Isabelle blows a whistle, which spawns a stop sign shooting up in front of her. When sweetspotted and without rage, it KOs middleweights from ground level at around 110%, making it quite powerful, while also being fast with a startup of 9 frames. However, due to largely being vertical hitboxes with limited horizontal reach, the move is difficult to land, and said lack of horizontal reach limits it ability to effectively punish out of shield despite the fast startup. Because the move's projectile properties bypass hitlag, effectively giving Isabelle more frame advantage on hit, it can also combo into neutral aerial, up aerial, and forward aerial at low percents.

Can technically anti air, but is generally impractical for doing so. The foe would need to be at KO percent for it to be worth the risk, as landing the move on an aerial opponent would require a hard read. Only the 'sign' hitbox would hit, which takes longer to come out than the 'Isabelle' hitbox and would inflict slightly less total damage.

It is possible to utilize this move as a part of a high damage output shield break option, but timing is tight, and likely character dependent. Place a Lloid trap onto the ground, and push the dazed opponent into the trap by walking into the opponent. As soon as the trap is set off, perform her Up smash. Then, double jump and hit the opponent with Up air before the final hit of the activated Lloid Trap launches the foe away. If executed perfectly, with no move staling, upwards of 50 percent damage should have been dealt. It is extremely easy to miss one of the Up smash hits, or miss the Up aerial input entirely. Can confirm this works at least somewhat consistently on Donkey Kong.

Asides from Neutral air, Up smash is Isabelle's only other practical out of shield option.

Update History

4.0.0

• Up smash's second hit has more knockback scaling (111 → 116).

8.0.0

• The move has less startup (frame 11 → 9), with its total duration reduced as well (FAF 48 → 46).
• It starts charging sooner (frame 8 → 7).

Hitboxes

The second hit is tied to the stop sign, and is considered a non-reflectable projectile. This gives it some unusual properties; Isabelle does not experience hitlag from it, it can clang with aerial attacks, and it does not have its damage modified by Isabelle being giant or tiny.

ID	Part	Rehit rate	Damage	SD	Angle	Angle type	BK	KS	FKV	Set weight	Radius	Bone	Offset			H×	SDI×	T%	Clang	Rebound	Effect	Type	G	A	Sound	Direct	Hit bits	Hit part	Blockable	Reflectable	Absorbable	Flinchless	No GFX	Heedless
Hit 1
0	0	0	2.0%	0		Forward	0	100	70		4.5	top	0.0	4.0	6.5	0.0×	1.0×	0%							Punch		All	All
1	0	0	2.0%	0		Forward	0	100	60		4.5	top	0.0	4.0	6.5	0.0×	1.0×	0%							Punch		All	All
Clean hit 2
0	0	0	12.0%	0		Standard	32	116	0		3.0	top	0.0	3.0 to 13.0	0.0	1.2×	1.0×	0%							Kick		All	All
1	0	0	12.0%	0		Standard	32	116	0		4.5	trafficsign	0.0	3.0	0.0	1.2×	1.0×	0%							Kick		All	All
Late hit 2
0	0	0	10.0%	0		Standard	32	116	0		3.0	top	0.0	3.0 to 13.0	0.0	1.0×	1.0×	0%							Kick		All	All
1	0	0	10.0%	0		Standard	32	116	0		4.5	trafficsign	0.0	3.0	0.0	1.0×	1.0×	0%							Kick		All	All

Timing

Charges between	6-7
Stop sign activation	8
Hit 1	9-10
Clean hit 2	14-16
Late hit 2	17-18
Interruptible	46
Animation length	63

Isabelle
Sign

Legend (1 square = 1 frame)

Lag time

Charge interval

Hitbox

Hitbox change

Prop event

Interruptible

Isabelle's moveset

Neutral attack · Forward tilt · Up tilt · Down tilt · Dash attack · Forward smash · Up smash · Down smash
Neutral aerial · Forward aerial · Back aerial · Up aerial · Down aerial
Grab · Pummel · Forward throw · Back throw · Up throw · Down throw
Floor attack (front) · Floor attack (back) · Floor attack (trip) · Edge attack
Neutral special · Side special · Up special · Down special · Final Smash