DB3/Ex DB3 punish charts assuming you can't get a jab or other regular starter. * means it's situational and to see the notes.
Updated as of Ferra patch
Spoiler: Ashrah
Move DB3 Ex DB3 Notes D1 N Y D3 N Y F3 Y* N Specifically referring to point blank, cross-up F3 where she lands too far away for a regular starter. 122 N Y 21 N Y F42 N Y F423 N Y
Spoiler: Baraka
Move DB3 Ex DB3 Notes D1 N Y D3 N Y B3 Y Y B31 N Y F3 N Y 444 N Y
Spoiler: Ermac
Move DB3 Ex DB3 Notes D1 N Y D3 N Y 123 N Y 2 N Y* Safe at point blank 21 N Y 4 N Y F4 N Y D4 Y* Y* Spacing dependent
Spoiler: General Shao
Move DB3 Ex DB3 Notes D1 N Y D3 N Y D4 Y Y* Ex DB3 works at point blank only B1 N Y 22 N Y B32 N Y B2 n Y* Flawless block only
Spoiler: Geras
Move DB3 Ex DB3 Notes D1 N Y D3 N Y D4 N Y* Spacing dependent B4 Y N B12 N Y F4 N Y
Spoiler: Havik
Move DB3 Ex DB3 Notes D1 N Y D4 Y* Y* D3 isn't punishable. DB3 punishes everything except max range. Ex DB3 is spacing dependent.
Spoiler: Homelander
Move DB3 Ex DB3 Notes D1 N Y D3 Y Y* Ex is spacing dependent. Just use regular. B4 N Y F4 Y Y D4 Y* Y* Spacing dependent
Spoiler: Johnny Cage
Move DB3 Ex DB3 Notes D1 N Y D3 N Y B3 Y* N Referring to spaced B3 where it's too far for a regular starter. 214 N Y
Spoiler: Kenshi
Move DB3 Ex DB3 Notes D1 N Y D3 N Y D4 N Y* Spacing dependent F22 N Y 44 N Y DF1 N Y Sento D1 N Y Sento D3 N Y Sento D4 N Y F2 N Y
Spoiler: Kitana
Move DB3 Ex DB3 Notes D1 N Y D3 N Y B4 N Y* Only the worst, most point blank ones are punishable. B3 N Y F1 Y Y 2 N Y B33 N Y B1 N Y* If flawless blocked and spaced poorly, or else too much pushback B14 N Y* If flawless blocked B2 N Y 4 N Y BF1 N Y
Spoiler: Kung Lao
Move DB3 Ex DB3 Notes D1 N Y D3 N Y F3 N Y F4 Y N Ex BF1 N Y* Ex BF2 N Y
Spoiler: Li Mei
Move DB3 Ex DB3 Notes D1 N Y D3 N Y B24 N Y
Spoiler: Liu Kang
Move DB3 Ex DB3 Notes D1 N Y D3 N Y 33 N Y 32 N Y* If flawless blocked
Spoiler: Mileena
Move DB3 Ex DB3 Notes D1 N Y D3 N Y F2433 N Y F4 N Y* Can be spaced to be safe Air Ex DB4 Y* Y* She can be punishable
Spoiler: Nitara
Move DB3 Ex DB3 Notes D1 N Y D3 N Y 12 N Y F12 N Y 3 N Y* Spacing dependent 34 N Y* Divekick can be made safe
Spoiler: Omni Man
Move DB3 Ex DB3 Notes D1 N Y D3 N Y B11 N Y F3 Y Y
Spoiler: Peacemaker
Move DB3 Ex DB3 Notes D1 N Y D3 Y Y* Ex is spacing dependent. Just use regular. B4 N Y* Only if point blank
Spoiler: Quan
Move DB3 Ex DB3 Notes D1 N Y D3 Y Y* Ex is spacing dependent. Just use regular. 13 N Y F21 Y N Too far for ex, regular hits every time. B3 N Y B34 N Y
Spoiler: Raiden
Move DB3 Ex DB3 Notes D1 N Y D3 N Y B2 N Y 123 N Y* If flawless blocked F224 N Y F434 N Y
Spoiler: Rain
Move DB3 Ex DB3 Notes D1 N Y D3 N Y F1 N Y* Can be spaced to be safe B2 Y* N Spacing dependent F2 N Y* Can be made safe against crouch block D4 N Y 112 N Y* If flawless blocked 4 Y* Y* Flawless block data listed in-game is wrong. Really -17 on flawless block, not -7 as listed.
Spoiler: Reiko
Move DB3 Ex DB3 Notes D1 N Y D3 N Y 34 N Y 4 N Y
Spoiler: Reptile
Move DB3 Ex DB3 Notes D1 N Y D3 N Y 114 N Y 3 N Y* Can get a punish at most spacings B31 N Y F311 N Y* If flawless blocked
Spoiler: Scorpion
Move DB3 Ex DB3 Notes D1 N Y D3 Y Y* Ex DB3 can whiff depending on the spacing. Just use regular DB3. F4 N Y
Spoiler: Shang Tsung
Move DB3 Ex DB3 Notes D1 N Y D3 N Y B223 N Y F434 (Young) N Y F32 (Old) N Y* Spacing dependent. F41 (Old) N Y
Spoiler: Sindel
Move DB3 Ex DB3 Notes D1 N Y D3 N Y 2 N Y
Spoiler: Smoke
Move DB3 Ex DB3 Notes D1 N Y D3 N Y D34 N Y 21 N Y F231 N Y* If flawless blocked
Spoiler: Sub-Zero
Move DB3 Ex DB3 Notes D1 N Y D3 N Y 12 N Y F12 N Y 21 N Y 212 N Y 34 N Y B3 N Y B4 N Y* Spacing dependent. D4 N Y
Spoiler: Takeda
Move DB3 Ex DB3 Notes D1 N Y D3 Y Y* Ex is spacing dependent. Just use regular. F12 N Y F2 N Y B3 N Y B4 N Y* Spacing dependent F4 N Y D4 N Y Ex DF4 N Y* First rekka
Spoiler: Tanya
Move DB3 Ex DB3 Notes D1 N Y D3 N Y 2 N Y DF1/Ex DF1 N Y Air DF1 Y* Y* Spacing dependent Ex Teleport N Y* If for some reason they don't cancel into an attack
Kameos
Spoiler: Sektor
Move DB3 Ex DB3 Notes F+K N Y* Flawless block data listed in-game is wrong. Really -7 on flawless block, not 0 as listed.
Spoiler: Tremor
Move DB3 Ex DB3 Notes Crystalline F+K N Y* Flawless block for no pushback