I might get a lot of hate, and maybe even accused of flame baiting again, but... I only have a few ideas for Imaginators, and I only have 1 concrete one: replicating Sir Hoodington.
So, there are only 4 pieces of gear that concern me at the moment (one of each type):
Shoulderpad: Double Guards
Bracelets: Spike Bracelets
Leg Guards: Ol' Faithful Leg Guards
Backpack: None
Weapon (Sword): Laserblade
I want to be able to boost their stats ASAP. From what I can tell, all of those are weak by default. (Even the one that i THINK is supposed to be mythic/ultimate [the sword has less than 20 attack...)
(Besides, I've waited 4 games for a way to actually boost the stats of SOMETHING without hats... [SC challenges didn't do it 4 me. The stat boosts were small [not like the large boosts from heroics did much, so... Even more pointless

] I don't want to wait any longer for any partial reintroduction of RPG elements)
Along with the other 4-10 other pieces of concern to me atm.
(I don't know what they are called, exactly how they look, or even if the right kinds exist [non-skeletal backwards knee plox]) On one hand, if you want to have the full collection of parts to choose from to see what's available and weigh your options, I doubt the creator app will have duplicates, plus it's a better way to test your designs without committing to a class.
It'll take a while to get all your parts on the app alone, (timed chests) but it's a tad more reliable, plus you can speed up the process by "chirping" Imaginators with parts you don't have on the app to speed things along. (Which actually makes it faster still, bc you can add all the parts you have in Imaginators to the app, but the parts you find in the app are only usable if you order a card or print until you find it in the console version), and lastly, you can unlock Sensei exclusive parts for the app to test out if you really need a Sensei's parts for what you have in mind (It's a safer, more reliable, and quicker method of getting the full selection of parts.)
TLDR: The app is an overall better way to fine-tune the asthetics, so being able to get duplicates without having everything is more desirable IMO, because it allows you to fine tune both function (in game), and form (through the app)
Heck, if you find a design you REALLY like, you can circumvent the need for a crystal, and just order a card.