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So I actually have a little idea about that ⚔️👒🗡️ ot3 (EGGHEAD ARC SPOILERS)

Seraphim!Zoro was the first human clone prototype Vegapunk did but he was just, dumped in some cell like a prisoner for any random testing. Until the marines attacked egghead and his cell was opened and he saw Luffy and Zoro fighting alongside one another. Seeing Luffy, he felt something stir within him. something familiar and pleasant. Excitement and delight. So when Zoro and Luffy defeated Lucci and they has a short respite, that's when 'Prototype' popped up and started to follow Luffy like a lost puppy and everyone got spooked for a minute thinking its one of the warlord pacifistas but Luffy saw he looks like Zoro. 'Prototype' is what Seraphim!Zoro was called by the vegapunk crew. Zoro's dna was used and his fighting data back at east blue was also used. Vegapunk tried to imbue him with an artificial devil fruit but his DNA keeps strongly rejecting it. So 'Prototype' is considered a failure by vegapunk but still uses him as a test subject. 'Prototype' was still being given updates in battle memory as they follow Zoro's improvement as a pirate and as time passes. Not to mention, Moria once lent a helping had to vegapunk who also studied and analyzed every move the Ryuma zombie made and fed that info to 'prototype' so his skills are also a no joke. Not to mention,

the Seraphim!Mihawk trains with Seraphim!Zoro. Which was only one of the reasons they kept prototype around.

Vega punk also made an imitation of Shusui that 'prototype' uses.

So prototype is very much like a quiet puppy. Feral when in battle but keeps to himself and is calm when not in battle. another reason Vegapunk deemed him a failure for not being aggressive like the successful new pacifista seraphims.

Vegapunk told Luffy not to worry about 'prototype' and that he's a failure and he will get rid of him but Luffy got mad and almost punched the vegapunk that said it. Luffy then saying, " DON'T TREAT HIM LIKE SOME ITEM. THAT'S ZORO'S CLONE. " covering 'prototype' protectively.

Vegapunk not really having a care for his failed experiemnts, just, told luffy he can have him.

So seraphim!zoro joins the crew. His name being give to him by Zoro - after Luffy's endless coercion LOL- Shiro. since his hair is white. The crew even scolding him to think of a proper name, that shiro makes it sound like Zoro is just naming a dog. But luffy likes it so they go with that.

Once Shiro joins joins the crew, Shiro eventually develops his personality to be closer to Zoro although, more quiet and stoic than Zoro.

Shiro also has sense of direction, but only because vegapunk made sure the seraphim intellect is high to create detailed tactics for war and battle.