Anyway here’s the reroll rankings from Appmedia and approximate translations

SS rank:

Marth: ‘Falchion’ has a special attack boost on non-colorless types, has a self-regen ability for 3 turns, and can block people(?)

Leo: broad walking and attacking range, aoe attack is strong, the weapon-linked ability might be narrow on range

Ryoma: can counterattack to ranged foes, which is a strong point as other melee ppl can’t do that

Catria: has a skill for minus 1 round before special skill, can reduce an enemy’s defense by 50% for hella damage

Takumi: rare archer type, will be very active as he can snipe

S rank:

Roy: defense increases when damaged, has special attack bonus towards green foes

Lucina: has Falchion, see marth. Can recover own HP and buff teammates’ attack

Lyn: follow-up hit after debuffing(activates under 50% health), can move twice per turn

Tiki: Special Skill has high attack, attack-oriented, has a skill for healing entire party

Chrom: Falchion, more defense/tank-oriented

Robin: colorless-type attack available, overall high stats

Aqua: ability to let allies move one more turn, so will be participating actively

No colorless are on S-rank btw

Fire emblem heroes gatcha: the long version

Once you enter the gatcha zone you can choose from 5 different coloured stones, red for fire magic/sword, blue for lance/lightning magic, green for axe/wind magic and colourless for healer/probably

If you choose from the same selection you have a little discount like 5->4->4->4->3 gatcha stones per roll so in the end you only use 20 gatcha stones instead of 25 if you quit the selection every time(which you probably won’t do lmao)

The highest star count you can get is 5-star!

When you roll watch for a little puff of smoke before the rock goes blue, that’s the animation for 4 or 5-star, if there isn’t you got a 3-star

You get a special character animation if you do get a 5-star(edit: only pickup targets get a special animation!) so that would be obvious

After your four rolls you can just delete/clear data if you’re on android and retry

You can skip all of Anna’s dialogue and so on which is a+ too