Honestly I barely remember the fifth scientist.Malva was a really interesting way to do a twist villain without it coming completely out of left field. Since up until this point in the series we'd expect gym leaders and elite four members to be pillars of morality (Giovanni's the exception, but they gave us 5 generations to forget that fact). So a character we had tangential recognition of through the holocaster revealing a vindictive and caustic backside to her newscaster facade was shocking, but also made complete sense because it had been established that the entire holocaster network was in Team Flare's control the whole time. So of course their newscaster would be on the payroll.
Honestly XY has these glimpses of interesting character moments but then nothing ever comes of them and some choices on the characters they emphasize and the ones they don't are really confounding. Like, Dexio and Sina pretty heavily play into the story but don't get battle models until Gen 7 and utilize a generic NPC model on the overworld.
But meanwhile we've got 4 team flare scientists each with a unique design and yet I bet most of you can't remember their names. It's like if you took the already underutilized Anthea and Concordia from Gen 5 and then doubled them.
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from left to right: Aliana, Bryony, Celosia, Mable.