Bowser Jr. (SSBU)/Up smash

Hitbox visualization showing Bowser Jr.'s up smash.

Overview

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Bowser Jr. performs a handstand to attack with the Junior Clown Car's spinning propeller. It is Bowser Jr.'s fastest smash attack, with its multiple hits being useful for pressuring shields or denying aerial approaches. Does 1% at the first hit, 1.3% for hits 2-4, 2.3% for hit 5, and 6% on the last hit.

This move received major buffs during game updates. Version 3.1.0 increases the knockback for the final hit, allowing to KO opponents easily. Version 9.0.0 has its hitboxes to increase in size.

Update History

3.1.0

• Up smash's last hit has more base knockback (32 → 38).

9.0.0

• Up smash has larger hitboxes (2.5u/2.5u/4u → 3.2u/3.2u/4.7u (clean loop), 4.6u → 5.1u (late loop), 5.5u → 6.5u (last hit)) that stretch farther horizontally (Z offset: -4u—7u → -6.5u—7u (loop), -4u—5u → -5u—5u (last hit)), with the last hit placed lower (Y offset: 24.5u—22.5u → 23u—21u). The looping hits also launch at different angles (120°/190°/140° → 105°/175°/140°), and their hitbox with the lowest priority deals more knockback (base: 0 → 30). Altogether, these changes allow the move to connect more reliably.

13.0.1

• The multihits and penultimate hit deal more damage (1.3%/1.0% → 1.7%/1.4%).

Hitboxes

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	1	0	1.0%	0		Standard	0	100	80		4.5	top	0.0	10.0	-5.0 to 5.0	1.0×	1.0×	0%							Slash		All	All
Multihits (early)
0	0	3	1.7%	0		Standard	0	100	18		3.2	top	0.0	18.0 to 16.0	-6.5 to 7.0	0.6×	1.0×	0%							Slash		All	All
1	0	3	1.7%	0		Standard	0	100	20		3.2	top	0.0	21.0 to 19.0	-6.5 to 7.0	0.6×	1.0×	0%							Slash		All	All
2	0	3	1.7%	0		Standard	30	100	50		4.7	top	0.0	18.0 to 16.0	-6.5 to 7.0	0.6×	1.0×	0%							Slash		All	All
Multihits (late)
0	1	3	1.4%	0		Standard	0	100	35		5.1	top	0.0	19.0 to 17.0	-6.5 to 7.0	1.0×	1.0×	0%							Slash		All	All
1	0	3	1.7%	0		Standard	0	100	20		3.2	top	0.0	21.0 to 19.0	-6.5 to 7.0	0.6×	1.0×	0%							Slash		All	All
2	0	3	1.7%	0		Standard	30	100	50		4.7	top	0.0	18.0 to 16.0	-6.5 to 7.0	0.6×	1.0×	0%							Slash		All	All
Final hit
0	0	0	6.0%	0		Forward	38	175	0		6.5	top	0.0	23.0 to 21.0	-5.0 to 5.0	1.8×	1.0×	0%							Slash		All	All

Timing

During the late multihits, the ID 0 hitbox can hit simultaneously alongside either the ID 1 or 2 hitbox due to having different part numbers.

Charges between	4-5
Hit 1	7-8
Multihits (early, late)	9-17, 18 (rehit rate: 3)
Final hit	22-23
Interruptible	54
Animation length	65

Legend (1 square = 1 frame)

Lag time

Charge interval

Hitbox

Hitbox change

Interruptible

Bowser Jr.'s moveset

Neutral attack (1 · 2 · inf) · 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
Forward roll · Back roll · Spot dodge · Air dodge · Techs
Floor attack (front) · Floor getups (front) · Floor attack (back) · Floor getups (back) · Floor attack (trip) · Floor getups (trip)
Edge attack · Edge getups
Neutral special · Side special · Up special · Down special · Final Smash