hi
i wanted to find out which is the biggest tarantula in the world that has a good nature
that is not very defensive

Dylan!! what's happening man!?
That's a bit of a tough question. In my experience there are species that are known to be feisty eg- S. calceatum, and those that are known to be puppies eg- Avicularia but i like to believe every T is an individual. As with dogs it is unfair to blame the breed for a bad nature.
I have a huuuge Lasiodora that is a puppy and others will tell you they are raging bulls. It all comes down to the individual spider.
I don't own a T. blondi but I have only heard of their aggressive natures until I saw a recent post of one being handled.
So there u have it- that post probably shows the world largest tarantula specie in a mans hands like kitten.
Maybe that person can comment, I forget who posted it.

I dont consider myself an exspert in any way. I can just give feedback of what I exsperience with my own few T's. I have a huge Lasiodora parahybana that is as gentel and friendly as a big kitten, but I think within a serten specie you will get individual with diffrent personalaties. I also have a smaller L. parahybana that I will defnitly not handel.

Grammostola pulchripes- chaco golden knee
22cm of pure teddy bear but takes forever to get that size

mammon i reall y want to see that 22CM pulchripes. iv got a few theraphosas ,got 3 sterni females, a few apophysis juvies and a blondi female. each t i diferent, my biggest sterni girl
is such a softy where my smallest sterni girl has anger mamagement problems. but one
thing iv realised with collecting big ts, they rather run and hide than fight and bit.

if a theraphosa or lasiodora tried to bite, its only because they probably mistaken
u for food. my foreceps often get pulled out my hand from my sterni girl.