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Naveen is great. He's got a sympathetic background, personal interests, fun interactions. Everything you want a Pokemon character to be, nothing complex but there's SOME meat on the bone.
Taunie/Urbain could have been good, they come across as a little misguided but well intentioned initially, but the things they get involved in and do become increasingly frustrating. How stupid do you have to be to take a loan from a publicly recognised as shady firm, especially for something like filming a promo video which they have no way of ensuring would make the money back. Even in the finale, their involvement feels weird. "Hey btw all your shit you did to reach rank A after that tournament I lost in the first round of? I reached Rank A too L O L" and "battle me to decide who saves the city" then losing and going ACTUALLY I WANT TO DO IT ANYWAY both come across as weird.
Lida is extremely cute, very adorable design, cute animations, generally likable personality, but she... kind of doesn't really have shit going on. Her motivation is to be a dancer which is a fine baseline, but that doesn't go anywhere other than making you assume the connection she has to Tierno which she confirms early on. After that she has no development or conflict. The literal only conflict she has is her indecision on deciding to evolve her Staryu, but there's absolutely nothing to that conflict as it's brought up and then instantly resolved by you saying "yeah go for it" and she does it.
tl;dr Naveen is great, fun, likable, endearing. Taunie/Urbain started strong but quickly became frustratingly stupid. Lida is a top tier visually (design and animations) but a nothingburger character