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I liked them as a concept, but wished they were better utilized. Tierno should've been saved for ORAS or SM as a side character, since contests and Z-Moves would make his dancing schtick make more sense. Trevor could battle you less/stop you less, and could instead engage in optional trades to help both of you fill out the dex. Shauna felt like a worse Bianca, so I feel like her role could be changed a little. Maybe have her act more like rival Brendan/May, since the 3 of them are working with Professor Sycamore on his research.
Even though I felt like they were wasted potential and thought they were boring, I wasn't too annoyed by them, like I was with Cheren. Hau's not too bad.His interactions with Gladion were nice, and even though I felt like the malasadas thing was weird or forced, that aspect of him didn't overstay its welcome like Kukui's move puns did.