Imagine a sick Isolde Reverse: 1999 layout here
You'll get this instead, till I get inspired to deco this URL..

UPD.. I lied. This wont be about Isolde anymore. I have Dottore brainrot and I find a way to make everything about him.

Overall description

Isolde is a Sub-DPS that is primarily designed for Reality Damage dmg dealers who do Crit-Focused Damage. Isolde has a variety of buffs and debuffs and I love her a lot. I would be nothing without her buffs.
She's F2P friendly too, you don't really need her portraits, but her P1-P3 are good. P3 might be a stretch if you don't plan on using her that much for team building.

Ultimate : "Choking on Blood"
( Shamelessly took this info from her Wiki)
Mass Debuff. Inflicts 5 stacks of Burn on all enemies, and additional 5 stacks of Burn on the main target, at the same time, grants 1 stack of Rousing Morale to all allies, and then casts Intermezzo as a follow-up attack on the targets. For every excess stack of Burn on the main target, this Intermezzo gains Incantation Might +15%.

So basically. Gives a debuff to all enemies & buffs your team, then she does a follow up atk with big girl dmg + the dmg of the follow up is better when the enemies debuff is higher.

Buffs / Debuffs :
3 stacks of preignition to all allies at the beginning of each round
1 stack of Power Burst to all allies at the beginning of each round (Finale)
1 stack of Rousing Morale to all allies after using her Ultimate
25/35/50% CRIT DEF Shred
20%(25% with burn) Reality DEF Shred
++ Big amount of personal damage bcz of Penetration boost and a high % on Debuff skill.

Building
AvAkLUQtFCQEJlRAAEgRNAIqICghJEFBQEFSRWA
^ This is the code for her best resonance build! Use her with Genuinity too for better results.

I use her DPS signature psycube (Shadows in the Subconscious) but Blasphemer of the Night & Yearning Desire are good alternatives, last one is her Support attribute psycube btw.

Of course, max out her Euphoria and her Insight + Level, also max lvl up her psycube. Lvl 10 for Resonance is good, but maxing that out too is best.

Teams or whatever :
In my OLD team, I used her with A Knight, Tooth Fairy & Bkornblume. Mainly for her buffs / debuffs and not so much for DMG, since A Knight is the main DPS in this team.
NEW team is A Knight, Melania, Isolde & any healer or shielder to keep these 3 alive (I use Tooth Fairy). A Knight mains plsss this team is so good. A Knight does an insta ultimate dealt at the start of every round (If you have his Euphoria maxed), Melania acts as a subdps while you build up A Knight's ap (Although you could replace her woth any other DPS/Sub-DPS or even another Support....... Melania is not that good imo She's lowkey mid) & Isolde deals buffs for both of them + debuffs enemies, then deals some extra dmg that really helps out in the long run with high health bosses... If ur A Knight build is good u can deal 500k or more of dmg trustttt.

A more Isolde-centric team is Isolde, Beryl, Fatutu & Flutterpage. Isolde is really good as a buffer and debuffer for Beryl in this team and also increases overall dmg with her ultimate. Can't really comment on this one since my stupid self never managed to get Fatutu or Flutterpage and now I'm suffering the consecuences (Flutterpage is in like 70% of teams)

Ironically, the current best Kakania teams don't include Isolde... But other teams with Isolde are:

Spathodea, Isolde, Lorentz & Marsha.
Marsha, Beryl, Isolde & Flutterpage.
Beryl, Lorentz, Isolde & Marsha.
Windsong, Vila, Lorelei & Isolde.
Blonney, Lopera, Medpoc or Kiperina & Isolde.
Marcus, Mercuria or Argus, Vila & Isolde.
^ Any Support character works in these last 3 teams, that's why I'm including them. Granted, there are better supports than Isolde you could use in these like Rhiannon and Paper Heron but we WANT Isolde ok.

Bkornblume is kinda like the 5* version of Isolde, you could use her instead of Isolde incase you don't have her. (Though, why would you be reading this is you don't?)
Shamane is also a similar character to Isolde, but he deals less DMG than her. I'm pretty sure there's newer characters u could use to replace Isolde in teams.

++ Characters that pair well with Isolde :
DPS : Spathodea, Jiu Niangzhi, Jessica & Any Reality-DMG dealer DPS tbh.
Sub-DPS / Supports : 37, Getian, and some I'm forgetting..
Healers : Honestly, apart from Tooth Fairy I don't know which healers work well with Isolde.

Ough...... Lesbians make me sick.

Isolde your garments areso pretty Im going to be in debt I wantthem All please bluepoch spare my soul and wallet

This took me way more than 30 secs Okay, I wrote this all by memory, and transcribing text from the wiki & official dc server. Owned by @ anatomy NS.