User blog comment:AntluntiumHarry/Is this Possible?/@comment-24843074-20170303183438

Yes it is possible. Once you have no more characters that need 5 pieces all together, the game just gives you separate pieces for them in Phenominal Character Packs. However, it only does this a few times until the start giving you customizations instead of other pieces. (Ex: You need 3 more Stuffy Sunflower pieces, the pack gives you those 3 pieces, plus two random customizations.)