This is just a idea im not sure if its possible
so With the sg plugin Is it possible to make a super craft bros plugin i know a server where donators start with items so choosing characters might be possible Also with the new 1.5 /effect command you might be able to use command blocks to give the Higher jumps and idk how You would get multiple lifes anyways is this possible?

Btw Double0Negative who created the plugin made a super craft bros plugin but its not public