NEW UPDATE!
I've finished incorporating the new suit/class! The new ice suit has 6 brand-new, unique skills; 2 shared and 2 unique for Mario and Luigi. Many of the new ice suit skills can also "freeze" the opponent, slowly draining FP and skipping the target's turn for 3 turns, with a chance of thawing out each turn and a greater chance of having the ice broken if attacked. In order to get the ice suit, you must kill Chompington, but where or who is Chompington? This enemy is located early in the game in the Mushroom Kingdom, so you don't have to spend too long looking for him if you have an idea of who he is! After obtaining the ice suit, you'll find a new portal which leads to a secret island where you can change into the new suits that you have already found!
For more up-to-date information, check out this link:
http://icugigasoft.freeforums.org/viewtopic.php?f=9&t=1393