Level 4 move and -3 on block. On IB, it's -7, therefore our available options are:

5P

2P

5K (longest range button from the listed ones, active at frame 7, therefore the punish has to be frameperfect)

2K (Has a lil' shorter range than 5K yet it's active at frame 5, allowing more consistency)

c.S (use if close enough)

The punishes are also tied to proximity.

For consistency due to 5K requiring to be frameperfect to gain slightly more range, I recommend going through the 2K routing when available.

2K whiffs slightly after the rounds-tart distance, where 5K .

Important Disclaimer:
All of this options get smoked by 5H>2D frametrap!!
Leo's 2D CH allows for combo pickup
All of this options beat 5H>6H

Routes

5K

Round start

5K > f.S > 5H > Bridal/5H*4, damage: 89/80
5K > 2S > 5H > Bridal/5H*4, damage: 87/78
5K > f.S > 2S > 5H > 5H*4, damage: 102
5K > 2D, damage: 43

5H_punish_5K_roundstart.mp4

Slightly past round start

5K > f.S > 5H > 5H*4
5K > 2S > 5H > Bridal/5H*4

The bridal ender route is quite finicky due to range and requires 2S to work, yet, if the spacing is slightly further, bridal will be blocked, therefore for consistency is recommended to be skipped.

5H_punish_5K_slightly_past_roundstart.mp4

Peak range

5K > f.S > 5H > 5H*4

Further than this distance, 5K will whiff.

5H_punish_5K_slightly_past_roundstart_max_range.mp4

2K

Note:
Recommended option.

2K > f.S > 5H > Bridal/5H*4, damage: 63/70
2K > 2S > 5H > Bridal/5H*4, damage: 62/69
2K > f.S > 2S > 5H > 5H*4, damage: 79
2K > 2D, damage: 34

5H_punish_2K_roundstart.mp4

2D

-5

2P/c.S/5K/2K

c.S requires IB

2P > 5K > f.S > 2H > 2D > Bridal seems the most consistent one

Special Moves

Graviert Würde

The fireballs.

IDK idc.

Deal with it.

H version disappears if Leo is hit.

Eisen Sturm

https://www.dustloop.com/w/GGXRD-R2/Leo_Whitefang#Eisen_Sturm

The DP

S Eisen Sturm

w Shotgun

Corner

After IAD j.KS, the j.D should be delayed "substantially".

j.7H setup

[SG.H] > IAD j.K > j.S ~ j.D > 2H > 236P, 5P > c.S > j.7H

Punish_Eisen_Sturm_S_w_shotgun_j7H_oki_corner.mp4

j.D sour berry setup

Couldn't get the wallsplat consistently.

[SG.H] > IAD j.K > j.S ~ j.D > 2H > 236P > c.S > j.S > jc j.K ~ j.S ~ j.H ~ j.4Toss |> 6H > reposition yourself > [Charge Shotgun] > SG.S > Pull_Berry > [SG.H] > j.7D ~ j.Toss

Punish_Eisen_Sturm_S_w_shotgun_wallsplat_jD_sourspot_corner.mp4

Shotgun sour berry setup

[SG.H] > IAD j.K > j.S ~ j.D > 2H > 236P > c.S > j.S > jc j.K ~ j.S ~ j.H ~ j.4Toss |> 6H > reposition yourself > [Charge Shotgun] > SG.S > Pull_Berry > [SG.H] (no wallsplat)

Punish_Eisen_Sturm_S_w_shotgun_sourspot_shotgun_corner.mp4

Midscreen

Remove shotgun and do a c.S route ...

wo Shotgun

Corner

Transition to shotgun route

You can set yourself in shotgun stance and charge a shot to proceed with the Shotgun routes from above.

Punish_Eisen_Sturm_S_transition_to_shotgun_route_corner.mp4

j.7H oki

c.S > > j.S > jc j.K ~ j.S ~ j.H ~ j.D > 2H > 236P, 5P > c.S > j.7H

Punish_Eisen_Sturm_S_j7H_oki_corner.mp4

Midscreen

c.S non CH antiair

c.S > j.S > j.P > j.S > jc j.S > j.P > j.S > j.H ~ j.D > j.236P

Punish_Eisen_Sturm_S_cS_midscreen.mp4

2P Rejump

j.K ~ j.S ~ j.H |> 2P > c.S > j.K > j.S > j.H > j.D > j.236P

Punish_Eisen_Sturm_S_2P_rejump_midscreen.mp4

H Eisen Sturm

w Shotgun

Point Blank Corner

charge shotgun > SG.S > [SG.H] > charge shotgun > [SG.H]*2 > SG.S > 236P > [SG.H]x3 > SG.S > berry toss > charge shotgun > SG.S > [SG.H] > 6H > 236P

Punish_Eisen_Sturm_H_w_Shotgun_PointBlank_Corner.mp4

Corner

Just requires being slightly spaced from Leo, enough to not get crossed up basically.

SG.H hits in the air https://twitter.com/zmasasi/status/1018378921786527744

Keys to success:

Pull berry when Leo is reaching the top, it will autotime SG.H at the right height

Midscreen

SG.D

Pull berry ASAP
delay throwing berry substantially.
You want to press SG.S > Bridal when Leo's swords touch the ground.
Quite tricky to get right and consistently.
Can't recommend over the next combo

Pull berry ... > SG.D ~ 4Toss ~ SG.S > Bridal ~ SG.S > [SG.H] > IAD j.S > j.D > c.S > j.K > j.S > j.H > j.D > j.236P |> 2Toss

Punish_Eisen_Sturm_H_w_Shotgun_midscreen_demolish.mp4

SG.D SG Loops

Same route from above, but this time doing SG.S > Bridal, [SG.H] instead of SG.S > [SG.H] > IAD j.S to proceed with shotgun loops in the corner.

Even more funky than the previous SG.D route, as this one requires Leo to be hit by the PineBerry explosion at a lower height, otherwise SG.S > Bridal will whiff.