6280-DD6F Enable Blob's Bomb move (away, away + down, down, 
towards + down, towards, punch)
For "always fight" codes, you must continue after each match whether you win or lose
DD4A-8548 + DD9C-E53E Always fight Bad Mr. Frosty after 1st match
DD4A-8548 + DF9C-E53E Always fight Taffy after 1st match
DD4A-8548 + D49C-E53E Always fight Tiny after 1st match
DD4A-8548 + D79C-E53E Always fight The Blob after 1st match
DD4A-8548 + D09C-E53E Always fight Blue Suede Goo after 1st match
DD4A-8548 + D99C-E53E Always fight Ickybod Clay after 1st match
DD4A-8548 + D19C-E53E Always fight Helga after 1st match
DD4A-8548 + D59C-E53E Always fight Bonker after 1st match
DD4A-8548 + D69C-E53E Always fight N. Boss after 1st match
FDF7-E5CE Start with 1/6 health--1st round
4DF7-E5CE Start with 1/3 health--1st round
7DF7-E5CE Start with 1/2 health--1st round
0DF7-E5CE Start with 2/3 health--1st round
9DF7-E5CE Start with 5/6 health--1st round
FD4A-E01C Start with 1/6 health--2nd and later rounds
4D4A-E01C Start with 1/3 health--2nd and later rounds
7D4A-E01C Start with 1/2 health--2nd and later rounds
0D4A-E01C Start with 2/3 health--2nd and later rounds
9D4A-E01C Start with 5/6 health--2nd and later rounds

For the rest of the codes, to change them into "do no damage" codes, 
change each "7D" to "DD" (May not work right in every case)

Bad Mr. Frosty Codes

7D46-E1C2 + 7D46-E132 + 7D46-E542 + 7D46-E512 + 7D46-E5C2 
Bad Mr. Frosty's Brutal Punches do more damage
7D46-E532 + 7D4B-E042 + 7D4B-E012 + 7D4B-E0C2 + 7D4B-E032 
Bad Mr. Frosty's Medium Punches do more damage
7D4B-E942 + 7D4B-E912 + 7D4B-E9C2 + 7D4B-E932 + 7D4B-E142 
Bad Mr. Frosty's Quick Punches do more damage
7D4B-E112 + 7D4B-E1C2 + 7D4B-E132 + 7D4B-E542 + 7D4B-E512 
Bad Mr. Frosty's Brutal Kicks do more damage
7D4B-E5C2 + 7D4B-E532 + 7D4C-E042 + 7D4C-E012 + 7D4C-E0C2 
Bad Mr. Frosty's Medium Kicks do more damage
7D4C-E032 + 7D4C-E942 + 7D4C-E912 + 7D4C-E9C2 + 7D4C-E932 
Bad Mr. Frosty's Quick Kicks do more damage
7D4C-E142 Bad Mr. Frosty's Snow Ball (all punches) does more damage

Taffy

7D48-E0C2 + 7D48-E032 + 7D48-E942 + 7D48-E912 + 7D48-E9C2 
Taffy's Brutal Punches do more damage
7D48-E932 + 7D48-E142 + 7D48-E112 + 7D48-E1C2 + 7D48-E132 
Taffy's Medium Punches do more damage
7D48-E542 + 7D48-E512 + 7D48-E5C2 + 7D48-E532 + 7D4A-E042 
Taffy's Quick Punches do more damage
7D4A-E012 +7D4A-E0C2 + 7D4A-E032 + 7D4A-E942 + 7D4A-E912 
Taffy's Brutal Kicks do more damage
7D4A-E9C2 + 7D4A-E932 + 7D4A-E142 + 7D4A-E112 + 7D4A-E1C2 
Taffy's Medium kick does more damage
7D4A-E132 + 7D4A-E542 + 7D4A-7513 + 7D4A-E5C2 + 7D4A-E532 
Taffy's Quick Kicks do more damage--Not in crouch
7D42-E912 Taffy's Whack (all punches) does more damage
7D42-E9C2 Taffy's Whack (all kicks) does more damage

Tiny

7D42-E1C2 + 7D42-E132 +7D42-E542 + 7D42-E512 + 7D42-E5C2 
Tiny's Brutal Punches do more damage
7D42-E532 + 7D43-E042 + 7D43-E012 + 7D43-E0C2 + 7D43-E032 
Tiny's Medium Punches do more damage
7D43-E942 + 7D43-E912 + 7D43-E9C2 + 7D43-E932 +7D43-E142 
Tiny's Quick Punches do more damage
7D43-E112 + 7D43-E1C2 + 7D43-E132 + 7D43-E542 + 7D43-E512 
Tiny's Brutal Kicks do more damage
7D43-E5C2 + 7D43-E532 + 7D4E-E042 + 7D4E-E012 + 7D4E-E0C2 
Tiny's Medium Kicks do more damage
7D4E-E032 + 7D4E-E942 + 7D4E-E912 + 7D4E-E9C2 + 7D4E-E932 
Tiny's Quick Kicks do more damage
7D4E-E142 Tiny's Medicine Ball Does more damage
7D4E-E512 Tiny's Sucker Punch does more damage

Blob

7D4D-70C3 + 7D4D-7033 + 7D4D-7943 + 7D4D-7913 + 7D4D-79C3 
Blob's Brutal Punches do more damage
7D4D-7933 + 7D4D-7143 + 7D4D-7113 + 7D4D-71C3 + 7D4D-7133 
Blob's Medium Punches do more damage
7D4D-7543 + 7D4D-7513 + 7D4D-75C3 + 7D4D-7533 + 7D4F-7043 
Blob's Quick Punches do more damage
7D4F-7013 + 7D4F-70C3 + 7D4F-7033 + 7D4F-7943 +7D4F-7913 
Blob's Brutal kick does more damage
7D4F-79C3 + 7D4F-7933 + 7D4F-7143 + 7D4F-7113 +7D4F-71C3 
Blob's Medium Kicks do more damage
7D4F-7133 + 7D4F-7543 + 7D4F-7513 + 7D4F-75C3 +7D4F-7533 
Blob's Quick Kicks do more damage

Blue Suede Goo

7D44-71C3 + 7D44-7133 + 7D44-7543 + 7D44-7513 + 7D44-75C3 
Blue Suede Goo's Brutal Punches do more damage
7D44-7533 + 7D47-7043 + 7D47-7013 + 7D47-70C3 + 7D47-7033 
Blue Suede Goo's Medium Punches do more damage
7D47-7943 + 7D47-7913 + 7D47-79C3 + 7D47-7933 +7D47-7143 
Blue Suede Goo's Quick Punches do more damage
7D47-7113 + 7D47-71C3 + 7D47-7133 + 7D47-7543 + 7D47-7513 
Blue Suede Goo's Brutal Kicks do more damage
7D47-75C3 + 7D47-7533 + 7D40-7043 + 7D40-7013 + 7D40-70C3 
Blue Suede Goo's Medium Kicks do more damage
7D40-7033 + 7D40-7943 + 7D40-7913 + 7D40-79C3 + 7D40-7933 
Blue Suede Goo's Quick Kicks do more damage

Ickybod Clay

7D49-70C3 + 7D49-7033 + 7D49-7943 + 7D49-7913 + 7D49-79C3 
Ickybod Clay's Brutal Punches do more damage
7D49-7933 + 7D49-7143 + 7D49-7113 + 7D49-71C3 + 7D49-7133 
Ickybod Clay's Medium Punches do more damage
7D49-7543 + 7D49-7513 + 7D49-75C3 + 7D49-7533 + 7D41-7043 
Ickybod Clay's Quick Punches do more damage
7D41-7013 + 7D41-70C3 + 7D41-7033 + 7D41-7943 +7D41-7913 
Ickybod Clay's Brutal Kicks do more damage
7D41-79C3 + 7D41-7933 + 7D41-7143 + 7D41-7113 + 7D41-71C3 
Ickybod Clay's Medium Kicks do more damage
7D41-7133 + 7D41-7543 + 7D41-7513 + 7D41-75C3 + 7D41-7533 
Ickybod Clay's Quick Kicks do more damage
7D45-7013 Ickybod Clay's Ecto Punch does more damage

Helga

7D45-71C3 + 7D45-7133 + 7D45-7543 + 7D45-7513 + 7D45-75C3 
Helga's Brutal Punches do more damage
7D45-7533 + 7D46-7043 + 7D46-7013 + 7D46-70C3 + 7D46-7033 
Helga's Medium Punches do more damage
7D46-7943 + 7D46-7913 + 7D46-79C3 + 7D46-7933 + 7D46-7143 
Helga's Quick Punches do more damage
7D46-7113 + 7D46-71C3 + 7D46-7133 + 7D46-7543 + 7D46-7513 
Helga's Brutal Kicks do more damage
7D46-75C3 + 7D46-7533 + 7D4B-7043 + 7D4B-7013 + 7D4B-70C3 
Helga's Medium Kicks do more damage
7D46-5033 + 7D4B-7943 + 7D4B-7913 + 7D4B-79C3 + 7D4B-7933 
Helga's Quick Kicks do more damage--Not far away
7D4B-71C3 Helga's Viking Ram does more damage

Bonker

7D4C-70C3 + 7D4C-7033 + 7D4C-7943 + 7D4C-7913 + 7D4C-79C3 
Bonker's Brutal Punches do more damage
7D4C-7933 + 7D4C-7143 + 7D4C-7113 + 7D4C-71C3 + 7D4C-7133 
Bonker's Medium Punches do more damage
7D4C-7543 + 7D4C-7513 + 7D4C-75C3 + 7D4C-7533 + 7D48-7043 
Bonker's Quick Punches do more damage
7D48-7013 + 7D48-70C3 + 7D48-7033 + 7D48-7943 + 7D48-7913 
Bonker's Brutal Kicks do more damage
7D48-79C3 + 7D48-7933 + 7D48-7143 + 7D48-7113 + 7D48-71C3 
Bonker's Medium Kicks do more damage
7D48-7133 + 7D48-7543 + 7D48-7513 + 7D48-75C3 + 7D48-7533 
Bonker's Quick Kicks do more damage
7D4A-7043 Bonker's Cutting Cartwheel does more damage