Kirby would barely know it, just spamming random letters.
Bandana Dee would be a little experienced, but not know advanced ones.
King Dedede would be the same as Bandana Dee, but mainly his Waddle Dees script for him.
Meta Knight will know how to script advance codes and created fully-fledges games.
Rick, Kine, and Coo would work together making basic scripts.
Marx would be a little bad at it, using only his feet to do it.
Gooey is the same as Kirby, but spamming numbers and symbols as well.
Adeleine and Ribbon would be good at it, because Adeleine is a human and Ribbon being a fairy (which is just a mini human).
Dark Meta Knight will be slightly worse than Meta Knight, making mostly horror games.
Daroach would be good at it, but Doc being just as good as Meta Knight.
Magolor would be slightly better than Meta Knight.
Taranza would be extremely fast at coding as well as being good at it.
Susie will be just as good at Magolor.
The Three Mage-Sisters would be at different skill levels, all being good at it with Zan being the best at it.
Dark Matter and Zero would be relatively bad at it.
Shadow Kirby would also be relatively bad at it, just being slightly better than Kirby.