While we have detailed guide pages for every one of the confidant cooperations in Persona 5 already, one cooperation in particular is different: that for the strength arcana, the Twin Jailers Caroline and Justine.
Rather than simply hanging out with them, the Twin Jailers want you to bring them specific Persona with specific abilities for each rank. As you level the pair up they unlock more Velvet Room functions for you, useful for getting better Persona for combat.
How to get them all can be a pain, so... here are the solutions we found for each rank.
Rank 1: Jack Frost with Mabufu
Jack Frost learns Mabufu at level 12. Jack Frost is a Magician Arcana Persona, and so with the story-driven progression of the Morgana Magician cooperation you'll be able to get enough bonus experience to boost Jack Frost up to level 12 from very early on in the game.
In order to fuse Jack Frost, fuse Berith (Hierophant) with Apsaras (Priestess).
Once this is done, show your handiwork to Caroline and Justine.
Rank 2: Shiissa with Frei
In order to get your hands on a Shiissa with Frei you'll need to make sue of move inheritance through fusion.
To fuse a Shiissa with Frei use Jack Frost (Magician) with Makami (Temperance) - Makami has Frei naturally, so you can then choose to inherit the Frei skill.
Rank 3: Matador with Magaru
A Matador with Magaru is another Persona that'll require you to do some fusion in order to get access to it with an inherited skill.
The quickest and easiest way to get a Matador with Magaru is to use a treasure Persona, Regent. Once you've found one of these once you can recall them from the compendium, but they're expensive.
Combine Mokoi (Death) with a Regent to create a Matador - pick up Magaru as the inherited skill from the skill-loaded Regent.
If you want to use two regular Persona instead you can achieve this by combining Nekomata (Magician) with Obariyon (Fool) - again, choose to inherit Magaru.
Rank 4: Flauros with Tarukaja
Fusing a Flauros with Tarukaja is the first task that requires you to get a bit more complicated: you'll need to fuse this guy with a group guillotine fusion.
Look to fuse Berith (Hierophant), Andras (Devil) and Eligor (Emperor) together to create Flauros.
To get Tarukaja you'll need a few levels boosted via an Arcana Burst - being Devil, Flauros is boosted by the reporter confidant cooperation. Alternatively you can level it a bit through fighting.
Rank 5: Ame-no-Uzume with Dodge Psy
We managed to get ourselves an Ame-no-Uzume Persona with Dodge Psy by fusing Kin-Ki (Chariot) with Sui-Ki (Moon).
Kin-Ki learns dodge psy at level 27 naturally, so you just need to boost it to that level either through the Chariot confidant cooperation with Ryuji or through some combat.
Once Kin-Ki has dodge psy, make sure you select it as an inherited skill when creating Ame-no-Uzume.
Rank 6: Neko Shogun with Dekaja
The quickest way we found to get a Neko Shogun with Dekaja was to start out with an Anzu (Hierophant) - this guy learns Dekaja at level 28. Boost there to get the move.
Your next step is to use Anzu in an advanced fusion - fuse it in a three-way with Kodama (Star) and Sudama (Hermit). Select Dekaja as your inherited ability and this rank is complete.
Rank 7: Lachesis with Tetraja
Strap in, as getting a Lachesis with Tetraja was a complicated multi-step process for us. Here's how we managed it:
- Fuse Lamia (Empress) and Sandman (Magician) to create Principality (Justice) - this Persona has Tetraja naturally.
- Fuse Principality (Justice) with Yaksini (Empress) in order to make an Ame-no-Uzume (Lovers). Make sure you inherit Tetraja as a skill.
- Finally, fuse your new Ame-no-Uzume (Lovers) with Isis (Priestess) in order to get your Lachesis. Please don't forget to inherit Tetraja - that'd hurt.
Rank 8: Hecatoncheires with Masukunda
To get a Hecatoncheires with Masukunda you'll need to fuse two higher-end Persona. Unicorn (Hierophany) and Lilim (Devil) will give you what you need, with Masukunda an available skill to inherit.
Another way to get this Persona is to fuse Clotho (Fortune) with Red Rider (Tower). You can also substitute Red Rider for Belphegor (Tower) - the result is the same.
Rank 9: Bugs with Samarecarm
Getting a Bugs with Samarecarm requires you to break out your advanced Persona Fusion tools once again - you'll need to combine Pixie (Lovers) with Pisaca (Death) and Hariti (Empress).
The move you need must come from Hariti, who learns Samarecarmat level 41. Boost Hariti there through some combat grinding or via an arcana burst, then have the resulting Bugs from the fusion inherit the move.
Rank 10: Seth with High Counter
High counter is an amazing move, but getting a Seth with High Counter requires another multi-step fusion process. Here's what to do:
- Gain a Skill Card from the mementos request / sidequest The Killer Laughs in the Garbage Can. You'll get this request on 10/14. This skill card lets you teach a Persona high counter, and is the quickest route to this move.
- Combine Hecatoncheir (Hanged) with Kushinada-Hime (Lovers) to get a Horus (Sun).
- Combine Isis (Priestess), Thoth (Emperor), Anubis (Judgement) and Horus (Sun) to create Seth.
- Use the ability card you got from the side quest to teach Seth High Counter and you're done!