If you make doppels capable of copying our level, skills and equipment, then MAKE THEIR MP AND HP LIMITED TO OURS TOO DAMN IT (yes im salty cuz my entire party killed themselves off of my darkness, point is still there tho)
Well the problem with HP is tricky here to begin with, tho thats only if you upgrade dakness enough. Its just that HER retaliation capabilities work against the team with dopps existence, because enemies dont do much dmg on their own so yiu dont retaliate much dmg even with a basic skill counter-attack (if any cuz immunities), but when YOUR allies have to deal with this effect, stuffed darkness does this:
-Remove any buffs (btw the greatest cheese of Jibrils need to charge attacks) OR makes any attacks on you crits
-Remove evasion (cuz in no hell you're gonna evade under +50% acc) OR 75% fear
-Do all that to your WHOLE SQUAD (or if you're too much boss focused all that and 75% confusion to one of your squad, tho considering everything now you cant even attack if not in fear already)
With riposte she just shots your allies (high str and +50% mark)
With thorn passive and thorn chestplate she returns more dmg than receives. (somhw, even tho she shouldn't, effect returns 50% dmg but ig it upgrades to 125 when doubled or som? idk)
And all that is just offensives, if you go turtle mode on her instead she makes enemies basically unkillable (especially in the LABIRINTH with their infinite buffs to reposte dmg or ignore it at all)