DNA Character Guide

Many character guides for Duet Night Abyss (DNA) go through what Weapons, Demon Wedges, Geniemons, and Partners each character should have.

This character guide will focus on instead other tips and factors and how the character is used and played.

Rebecca

Defense, Exploration, Expulsion, and Hedge missions when they are too hard to AFK reliably.
This means maximizing her long-term damage potential by fielding as many Aurelian Caress (Jellyfish Summons) at the same time and sustaining it over the mission.

MANUAL control recommended IF you are doing really tough defense/area denial content

But in practice you will almost never play her manually. There is so much area denial content she can help you handle that you might as well let the AI do it and go AFK on the mission.
As a PARTNER the AI skill management is terrible

Frequently gets stuck in running animation if any jumping is required to get to the player. Frequently just stays idle. Often she eventually moves and drops Jellyfish but some AFK runs can unexpectedly fail because of her AI pathing.

To reactivate her, move the main character. Sometimes you have to move really far to trigger her follow response to override her current looping running action.

The AI tends to spend Sanity as soon as it gets it and doesn't manage Sanity to sustain Aurelian Caress (Jellyfish Summons).
If she's equipped with a ranged weapon, she won't move as much but strangely she is also more hesitant to use Aurelian Caress to defend the location. If she has a melee weapon as Partner, she's likely to run off to engage enemies and spam all her Jellyfish there.
Even so, for Defense missions against fairly easy enemies, she will still do okay because enemies drop enough Sanity potions that she can rush around and relocate her Jellyfish. But once enemies start getting harder, AFK becomes more iffy, especially as sometimes the Partners literally just stand around doing nothing while enemies are right in front of them attacking the defense target or your main character.
If you hold down "E" instead of tapping it, you can place the Jellyfish at a distance. Even the AI doesn't seem to do this (though in general it's not that important).
She'll sometimes drop Jellyfish quite spaced apart especially once she's at Intron II and can put down five.

This means enemy drops can be quite far off and if you have an "ejection" Commission (where it ends suddenly) you could be missing some loot drops.
Most loot drops aren't particularly important, but over time, when you have 10000+ of a material, they are basically worth a lot of Coin.
You can try to mitigate this by limiting her line of sight, such as positioning yourself so that enemies have to come round a corner or through a door that closes. When enemies appear, then she moves, and since they are already close by, she'll probably drop her Jellyfish close.

Generally you want to stagger her Summons instead of dropping multiple ones at the same time.

This is especially important if you aren't killing enemies quickly enough for them to drop a lot of Sanity potions.
So if you need all three up to kill things before you get swarmed, and your Duration is 15 seconds, then space them out at maybe one every 5 seconds and refresh them as each one expires.
This is so that in between summons you get a chance to recover your Sanity and have 100% uptime on all Summons instead of suddenly needing around 100 Sanity to drop all three.

You also want to stagger the pulses. Each pulse has slight hitstun on the target, so if the various Jellyfish all pulse at approximately the same time, the overlapping stun results in a shorter duration overall. But if they pulse in sequence, the enemy gets repeatedly stunned and their advance and actions are slowed much more.

AI Partners do not get Demon Wedges so basically you are worried about her weapons.
Just go with ATK or Skill Damage. There is no point trying to do Skill Efficiency or Skill Duration because the AI doesn't bother trying to place carefully or conserve Sanity for Jellyfish uptime. Instead they run around placing as many as they can where the next clump of enemies is located.

You want the range of the Aurelian Caress (Jellyfish Summons) such that if you are standing near the center, enemies that attack at range will still have to enter the radius of your overlapping killzones before they can shoot at you.
This is important for Defense Missions if you want reliable damage without having to reposition your Summons.
Often you can choose your location you can try to find one where enemies are forced to close close enough to enter the field (e.g., they have to come around a corner or through a door). But sometimes Defense missions will just be in the wide open with no cover.
If you are using Bahamut's Misty Veil, the Skill Range bonus from that Demon Wedge will not be visible on your Total Attributes readout.

Skill Power and Attack -- Faster kills means less Jellyfish required on the field at the same time, meaning higher sustainability.
Skill Duration or Skill Efficiency

If you can get these high enough that you can sustain one more Jellyfish, then it's probably worth losing some Skill Power or Attack, IF you are in a prolonged battle.

Two Jellyfish is quite sustainable in the early game but if you can get it up to 3 constantly and overlapping, then you have basically increased your DPS by a straight 50%, which probably beats out any Skill Power or Attack you can manage.
But if its a shorter fight and sustainability is not a huge issue then you can spam all your Jellyfish at the start to try to win the fight quickly.

Prime-Serenity Demon Wedge to help with Sanity regeneration. Even in the late game this is a pretty safe choice but if you find your Sanity manageable then go with Prime-Morale.
Skill Range is nice but the amount is generally not significant and killing enemies too far out just makes grabbing their loot harder. Rebecca is good for controlled farming of high-density enemies so you want to just find a good location and focus on refreshing the Jellyfish Summons to have constant uptime on as many as you can.

You're generally not deploying her for her weapon. Focus on killing power of her Summons.

On paper it looks like a powerful burst attack but it costs a lot of Sanity compared to the damage over time you can get from sustaining your Jellyfish instead.

For all characters, the best Geniemon is generally Bro Boxie unless you're pushing the edge of what you can fight and winning by narrow margins.

You can get bonus drops apparently with even base Commissions Rewards and not just enemy drops.
There are only two known (guaranteed) spawn points so to ascend them further (and increase the bonus loot drop rate) you need the Yum-Yum Milk from Immersive Theatre.
The increased loot gathering range is huge for general convenience and AFK farming. Without this, you generally need to run around grabbing loot including Serum drops during Exploration missions.

One of the disadvantages of Bro Boxie however is you have less control over when you pick up potion drops. The game will automatically vacuum up for example a Sanity potion if you are even 1 point short of full Sanity. This can waste a lot of them for a character who needs to manage the supply over a long fight.
If you want more Duration and help with Sanity sustain, try a geniemon like Pyrootail which gives a Duration bonus and also drops a Sanity potion.

It does not appear her Jellyfish damage-over-time attacks Sybille's Chaotic Thunderorb (from her Stormcaller summon skill).

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