Obv alignement cops are the big ones (note that while sora has an alignement specific ability she's impossible to confirm herself, so we can never be sure about her):
Amelia Watson
Time Traveler (Passive) - Amelia Watson always starts the game as an Idol and is unaffected by Tarot Reading.
Investimigate (ER) - Target another player, you learn their secondary role and all abilities they possess. If this is the second time you've targeted the same player, you learn their primary role as well.
Watson Concoction (ER) - Target player's investigative abilities fail this Night. If the target used Asacoco this Night, it fails due to an overdose and the ability they copied is permanently disabled.
Gn+. can be protected and doubles as rolecop. Roleblock is probably only usefull after confirming someone as scum and somehow failing to lynch them.
Tokino Sora
Actual Idol (Passive) - You always appear as an Idol when investigated.
Daisenpai (Passive) - You are unaffected by all secondary offensive abilities from players that debuted after you. (That's everyone.)
Silent Stalker (ER) - Target another player, you learn who they targeted this Night and what types of abilities they used. (I/O/D/S)
So You're The Enemy? (1U) - Target a player, if they are an Anti and you correctly name their secondary role, their abilities are permanently disabled.
ER is a usefull inforole. Considering its a soft rolecop you probably want to target different people most of the time, usually suspicious people should be prioritized.
For the 1U its very likely to fail(have no effect and fizzle with no refund) under normal circumstances. Only use on people you know the role of. Can be used to confirm one person that claimed by asking them to use their ability after getting hit by this. That is actually really usefull, gives us an extra ame check on a person that claimed with extra steps.
Rolecops: both alignement cops have a rolecop ability
Yuzuki Choco
Nurse's Touch (ER) - Target another player, the first time they would die this Night, they live instead. If they have an ability that was changed or disabled, restore the original ability. You can't target yourself or the same player twice in a row.
Physical Examination (ER) - Target another player, you learn which categories of abilities they possess, but not how many. (ER, EoR, #U, Passive)
Both abilities are very good and should be used every night. Nurse is a doc that cant selftarget and the usual cant protect same target twice in a row. use on townreads. The other one is a soft rolecop that should be used on someone different each night. prioritize scumreads/verifying claims.
Ookami Mio
Tarot Reading (ER) - Choose a secondary role, you learn which player if any has that role.
Shrine of the Wolf God (EoR) - Target another player, any offensive abilities used by or on your target fail.
ER cannot be used on Ame. When no particular role is a suspect in suspicious activity, it's probably best to identify the remaining power roles (yes also as town). Those would probably be the docs (choco, gura etc) and the ame replacements (ollie, rushia). It doesn't target so when it fails a direct roleblock occured.
The usefullness of the second role is kinda hard to gage, but for the most part it prevents roleblock and vigshots, but not the nightkill. Should be used most of the time, but being eor it may be good to save it for when its needed. can be used on townreads or scummy vigs.
Ninomae Ina'nis
Sanity Check (Passive) - You are unaffected by abilities from players who are under the effects of Asacoco, Watson Concoction, or HAACHAMACHAMA.
Priestess of the Ancient Ones (ER) - Choose up to two abilities, you learn which players were targeted by those abilities this Night, and any investigative results obtained. You may not choose the same ability twice.
This role duplicates the info allowing verification of that information (or obtaining it in the first place when the person isnt cooperating for one reason or another) on top of learning who was targeted by the abilities. assuming no vigs and no scum dies (which seems like a decent average length with so many vigs around) the game will last 4 night phases, which is just enough to name each inforole, so i think only investigatives should be named (they are all er too).
Tracker/Tracer:
Sora see above
Gawr Gura
a (Passive) - a
Apex Predator (Passive) - You are unaffected by secondary killing abilities.
Bloop (ER) - Send Bloop to follow target player. You learn the names of anyone that targeted them this Night. The first time they would die this Night, they consume Bloop as emergency rations to survive and the Bloop ability is disabled permanently.
Trident (1U) - Target another player and spear them with your trident. Your target dies.
Bloop is a 1u doc that gets refunded whenever it fails on top of revealing everyone else that targeted the same target. can self target I think.
Also, 1 unrestricted vig.
Uruha Rushia
Necromancy (1U) - Target a dead player, raise them as a zombie of your alignment. There is a public notification revealing which player is revived, and they do not count for parity. They may not talk in the thread or a pad and you control their ability uses. If you die, they die as well. Any changes to their abilities while they were alive still apply, including # of uses remaining.
Date (ER) - Target another player, learn the names of anyone they targeted this Night.
No Cheating (1U) - If you learned of any targeting during a Date, target one of the involved players. Your target dies.
Revive can be used on a powerrole that will draw the nightkill directly. Considering identity and role are public the only way we can do better than drawing one nightkill is through protecting an undead ame from death (see docs) . then again scum might look for rushia directly which would kill both.
Info roles are always nice, so there should be a date every night.
Since reviving a cop and obtaining info yourselves isnt enough, this role also comes with a oneshot vig. as far as i can tell any cheater can be shot, even if it was more than one night ago, original target and all their targets. Quite powerfull indeed.
Honorabla mention oozora crossfiring tracks the target player, even though everything that comes in and out will be blocked.