Jabra had long black hair, Kaku was squared, like them Dalton and Chaka were bipeds, and Funkfreed wasn't human in any way regardless. Even Sengoku, the other Hito Hito, had his own face instead of a Buddha face. They tend to vary but to say Chopper didn't look exactly like a human the way Lucci appeared as a leopard near the end doesn't hold up across pretty much any other Zoan. They aren't usually less strange when compared to their DF animal.
In the CP9 cover story they looked like real animals pretty much, but they also had reason. There's no reason for Chopper to look human.
All of those are hybrid forms (arguably including Sengoku). You are mistaking the hybrid (cute Chopper) with the full beast (human Chopper). Regarding your mistaken examples:
1) An unexperienced Kaku first turns into his full beast form and it looks like a common giraffe. He says it himself. The square one is always his hybrid.
2) We only see Jabra's beast form in their cover story and it looks like a common wolf. Any other time he's using his hybrid.
3) Dalton and Chaka both were running on four legs when in beast form.
4) It is irrelevant that Funkfreed wasn't a human to the point. Focus on Sandersonia if you prefer.
5) Jack, Page One, Drake, Orochi, Kaido, Ulti, Queen don't look exactly like the animal of their fruit when transformed into full beast. Same case for Chopper.
What's the difference between Chopper keeping some fur and his nose in human form and Kaido keeping his horns and moustache in dragon form, for example?
The problem is that Their Full Animal form looks like their Animal, While Choppers Human form barely looks human unless if it was a Yeti model
Chopper's full animal form doesn't really retain more traits from his real self than Kaido's dragon or Orochi's snake. I don't see why you think he barely looks human.
