Doppelganger Arle is, well, a Doppelganger. Of Arle. Despite many clones appearing though, this one in particular seems a bit more... bitter. Though, you'd probably would be a bit bitter too if you were trapped in a box for god knows how many years. While normally, they pass themselves off as a masked clown called Pierrot, they used the circus they created (along with kidnapping Carbuncle) to lure Arle in so that she can "replace" her. Has a habit of breaking into laughter.
She serves as the final boss of Arle Nadja & Dark Prince's Story Mode.
She'll warp around via putting her mask on with the ruby in her other hand. She'll then reappear in a different spot. After around 2 or three teleports, she'll use a series of three attacks chosen randomly from her abvaliable options, warping in between. Be sure to keep track of her cape's aura so you aren't caught off guard by where she appears! After the series of attacks, she'll rest in place for around 4 or 5 seconds before warping again. This time is shorten on harder difficulties.
She'll fire up to three fireballs, two directly aimed at the player, one that will hit the ground and set a small fire trail for a bit. On harder difficulties, any fireballs that hit the ground will set a trail.
She'll summon a cloud above herself, which will strike thunder almost directly at where you are for 5 seconds or until dealt with. They'll always strike the same spot 3 times before disappearing. On harder difficulties, Doppel will summon multiple clouds.
If she's close enough, she'll directly try to strike you with a quick slash. You'll know she'll go for this if she tries warping next to you. This move will also trigger automatically on harder difficulties if you're too close to her when she finishes warping, which at that point will be extremely difficult to dodge, if not impossible.
She'll snap her fingers as a magical aura appears and starts to slowly chase you around. It deals damage with no hitstun if you gets too close and will explode after 8 seconds.
She'll use void hole to create 3 windboxes around the stage, and then grand cross to teleport next to Arle to try to strike up to three times. The third strike will always be directly from above, which will cause a earthquake that causes a few garbage puyos to drop. She'll only use this move once her HP is halfway drained. She may use it multiple times on harder difficulties