Support Costumes

Supports are the highest priority since they are the backbone of every team composition. Supports are the most SP efficient way to increase your damage, since you won't be able to use all of the abilities in an all-damage team on turn 1. They are your highest priority for costume duplicates and potential liberation. These costumes will never go out of style, unlike damage costumes that regularly get power crept. Doesn't matter who you use for damage, most of your team will come from this list.

This list is geared towards general PvE content: Story battles, Evil Castle, Last Night, and Normal and Challenge Battle in seasonal events. There is a separate list for what you'll need for Fiend Hunt and Guild Raid.

Note: This is still a work in progress.

Core	Auxiliary	Notes
Essentials
		Pure White Blessing is essential for Last Night. The Gluttonous can be nice to take for Tower of Salvation
		Note that she has 2 idol costumes. The other is primarily used in Fiend Hunt/Guild Raid, so make sure you're getting B-Rank Idol and not Top Idol when doing selective draw picks.
		Onsen Manager is essential for Last Night.
		Shrine Maiden of Purification can be used in place of Beachside Angel Teresse for physical or high-chain teams.
		Beachside Angel is immensely useful but limited. Medical Club is essential for Last Night and useful in Tower of Salvation if you don't have any other ATK buffers. Angel of Destruction is useful for repositioning multiple enemies.
		Code Name A can reduce enemy's DEF, but this is rarely useful. Steel Engine can remove Barrier and Energy Guard, but this is also rarely useful.
Uncommon
		The Fiend Scholar is useful if you need to stall but Lucrezia's range is too small. Sage of Blue Clouds is the cheapest 3x3 chainer and decent for Last Night. MVP of Tower of Jealousy and Tower of Wrath, and pretty good for Tower of Salvation.
		Both costumes generate chains and have Concentrated Fire, which can help your characters hit targets they ordinarly wouldn't be able to hit, but they have different damage amplification methods.
		They're decent 3x3 chainers, but Rafina and Levia are usually superior choices.
Niche
		White Cat is useful for repositioning enemies. Red Riding Hood is essential for Last Night and occasionally used with Apostle Blade to help her survive so she can counter.
		She's limited, but you can get 1 copy by completing Summer Knight on normal. This is the best evasion tank, and she has a potential that also gives SP recovery. Useful in Tower of Salvation if you're struggling to survive.
		All of her costumes dispel. Pool Party has the lowest SP cost, The Magic School Professor has the largest range.
		Dispel
		Dispel
		Reduces DEF and RES, though this is rarely useful since it can't go lower than 0. Of the costumes capable of doing this, hers has the largest range.
		Tanks are rarely used for general content, but she is useful on some of the Tower of Wrath floors.