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Fifteen fully 999 maxed out chibis later in mahoyaku, decided to make a thread for people who want to make them if anyone is interested!
While there are a couple of cards that have a % chance of increasing the possibility of great success happening, the cards with that skill and a skill that increases parameter gain by 70% are extremely!!! helpful. The ones I own are mithra, riquet, and arthur
Nero is also good because has great success skills for both parameters and resting, which is extremely helpful if you can't use any of the +10 stamina every turn cards because they have personality traits that go against a specific chibi you're trying to make
This Figaro is an honorable mention because he was an event card so a lot of people have him. He doesn't have a parameter great success skill, but he does have a 70% bonus relax skill. The 70% bonus skills activate more frequently. His second skill is great success for resting.
Using a maxed out card as your base card and party cards helps a lot!! You start out with higher parameters in general if you do.
DO NOT use manuals. 90% of the time they do not work and since you can only bring three items every time you train, don't waste space bringing these
Better alternatives are herbs, but only ones with flowers. They make your status great or good, depending on which one you use. I've found that skills activate more frequently the better your status is. You also get more random great success in parameter gains
I don't own every card, but in general you want to have cards with a 大成功 parameter skill or 70% increase in a specific parameter skill. Having a card with 大成功 for resting helps a lot if you don't have access to rustica or lennox for +10 stamina every turn or can't use them
A combination of 大成功 and 70% increase skills activating on the same turn are godsends…… I've seen parameters gains up to 252 when this happens (not every time tho, depends on the level the parameter has). I regularly see parameters gains of 120+ when both skills activate
Using rustica or lennox or any future cards with +10 stamina every turn is extremely helpful but since these cards aren't as common and personality traits are more important than parameters for specific chibis, I made this guide with this in mind
If you have any other suggestions or if I've said anything incorrect please let me know so I can add it to this thread 
Have fun raising chibis!
Have fun raising chibis!
