
Yamato is on my top 3 charaters I want to join the Straw Hats.
1- Bon Clay, obviously
2- Brûlée, just because it's funny
3- Yamato

Carrot isn't bad per se but to me, she isn't particularly exciting either, at least to me. The remaining open spots in the crew (if oda follows what Luffy said in the beginning of story about the number of his crew members) so I'd rather those spots be filled with amazing people and leave the "less exciting'" characters as allies of the crew

Well she has the criteria needed to join. She can be the Lookout of the crew, they need a proper Lookout in place of Zoro. She lost Pedro and has the skillsets of both Electro and Sulong to offer. Plus, she doesn't know about the rest of the world, only Zou. Like Chopper, she can join the Straw Hats and learn more about the world.
Definitely the most kagurabachi manga ever made