This is a guide that will let you easily see all the formations of the game, as well as the datamined data that shows the chances of each enemy attacking your unit (numbers in yellow), bonuses provided by the formation (numbers in blue) and debuffs provided by the formation (numbers in red).

The unit that provides the formation will be listed in white.

All formations will have their names (and the names of which unit gives it) listed in plain text before the appropriate image is posted, so you can easily find the formations by using Ctrl + F.

Formations will be listed in alphabetical order.

All the numbers provided in this guide were datamined, but that doesn't mean the information is 100% accurate, as the game is still a bit too new, so the formulas weren't datamined yet. Here are the things I'm not 100% sure about that you should be aware of when using this guide.

Attack/Defense Bonuses/Downsides: All of those are listed as flat numbers in the datamine. I have no way of knowing if the game treats them as flat values or if it treats them as percentages. I assumed percentages because that's what makes the most sense to me, but it's totally possible that the formations actually give flat values for the bonuses. Take it for what it is.

Speed Bonuses/Downsides: The datamine lists those as -3 to +3... However, differently from stuff like Physical Attack and Physical Defense, Speed was a stat that actually existed in the original. And in the original, formation bonuses of speed went through a specific formula that translated -3 to +3 to -75% to +75%. I have no way of knowing for sure if this formula is still the same or not in the remake, but based on my anecdotal experience, the boost provided by something like Imperial Arrow is more than a flat +3 to the speed of the frontline unit, so I feel pretty confident in assuming that the speed formula of the original was kept. It's still an assumption though, so take it for what it is.

Flying Sword: As tested by @moot in the comments of this very guide, each attack increases your Overdrive bar by 10% when hitting a weakness, and by another 2% for each additional enemy. What the Overdrive numbers in this formation do, is to add a flat modifier to how much Overdrive you gain per enemy hit, so... Using the +5% number, if you hit one enemy with weakness, you'd get 15% Overdrive bar, and if you hit two enemies with weakness, you'd get... I'm not sure if it's 17% or 22% in this situation, actually, as I haven't done the testing myself, but you get the idea. At the very minimum, if you are hitting an enemy 5 times a turn in their weaknesses with this formation, you should increase your Overdrive bar by at least +13% when compared to the normal amount, which certainly looks better than the initial impressions I had when seeing those numbers.

A handful of specific percentages: The datamine doesn't tell you which unit is which when assigning percentages. This usually isn't a problem, as there are usually enough context clues to make me easily capable of assigning the numbers to the appropriate units, but in a handful of formations I had to do some guesswork... Specifically, in Witch's Cap, I have no way of knowing which unit is the 40% and which unit is the 30%; In Crescent Tide, I have no way of knowing which unit is the 30% and which is the 25%; In Puppet Army and in Winged Quintet, I have no way of knowing which unit is the 18% and which is the 17%. I still think I have enough context clues to have gotten all of those right (front unit is usually the one with higher percentage, which is why I assigned those numbers for Witch's Cap and Crescent Tide; and in formations where the numbers in the datamine start in the center, it tends to go Right -> Left -> Right -> Left when referring to the units, which is why I put the numbers in Puppet Army and Winged Quintet in the positions they are in), but I can't say it with 100% certainty, differently from all the rest... Oh, and Fanged Assault technically qualifies too with the 30% and 25%, but I'm pretty confident that this one was listed right to left in the Datamine, so I seriously doubt I got it wrong.

Trivia: Fanged Assault is the only formation in the game that doesn't have all 20% as the hit chance of units when the formation is broken (or when a unit is downed? I dunno, the datamine isn't clear on that... Anyways). The percentages are instead (from right to left): 12%; 25%; 25%; 25%; 13%. I have no idea why this is the case, but I thought it was a funny trivia to share, because no other formation does this.

Anyways, onwards to the important part.