carrot doesn’t have a lot of mysteries that surrounds her character whatsoever. Nor does she have an enemy that really has hindered her progress in life in a future arc. Most of her enemies have already been defeated by non-strawhats so there’s really no incentive for her to continue her journey with them. Carrot has been much more of a sense of curiosity rather than mystery. The two mysterious characters in whole cake island Ark were reiju and pudding. Carrot by comparison just felt like a background character and support character just going along for the ride and displaying what minks were capable of. Her personality zou, and going whole cake island was basically like this
What Does This Button Do? (original) - YouTube
That’s all there is to it. She was not special mink that made her different from any other mink she wasn’t on top of her class. She was just an underling in a musketeer that’s it. When we landed in wano she was pushed to the background and became less relevant as the arc went on.
Carrot fight wasn’t even on full display in comparison to Yamato. Her potential goal that fans had interpret would be shaft by Oni princess who seems know more about it while Carrot remains silent what is it about. The traitor in zou turn out to be kanjuro all along that sent jack to zou while carrot remain loyal to the alliance. Which is not a bad thing, but I think fans want to see other side to carrot instead this cheerful persona.
Robin by contrast in alabasta, skypia, and the foxy arc had a lot of mysteries surrounding her character. For example
Robin the government has been looking for her 20 years
She had bounty at the age of 8
She sunk 10 battle warships
She knows something about the will of D
Every organization she had work within past has been annihilated the only person who escape was her
Reading the poneglaphs
There to many enemies within her dream.
An island was destroyed during buster call
water 7 and enies lobby would tell us everything we needed to know. Robin after alabasta would be consider be the member group. However, She wouldn't call strawhats there names except for Luffy. It was not until thriller bark robin would eventually call her new found friends by there real name instead of the roles they have.
Before Robin we had Nami who also had mysterious surrounding her character during the orange town, captain kuro and baratie arc. She was already considered member of the team. Nami for example had this
she Hates pirates
She loves money and tangerines
Pirates took something very deer to her
Wants to collect 100 million berries to buy a certain land
Pirates do nothing more than destroy
Surprise by Luffy words he considers his crew his friends when being angry when captain kuro attack his own men.
Arlong wanted poster
She wants to be free
Bellemere
The Arlong Park arc would tell us everything we needed to know