Found this on another forum… thought someone may find it interesting here.
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I read the Dressrosa chapters again and concentrated on this topic trying to pick up hints. Rebecca's Father [Toy Soldier] is originally a Dwarf, not a human. First thing first, let's get some presumptions and misconceptions out of the way.
Toy Soldier Is Riku's Son… NOT!
The first presumption all fans make is that Toy Soldier is the son of King Riku. This is currently unconfirmed, neither has Toy Soldier himself mentioned it, neither has it been mentioned in the past that he was Riku's son. At the same time, I believe Rebecca's mother Scarlett is Riku's daughter (royalty), look at his second daughters name – Viola (Violet). Both of them have a name that is also a color, isn't it more than a co-incidence? I believe, King Riku has two daughters, thus making Toy Soldier not his son.
Rebecca's Father Was Turned A Toy The Day Doflamingo Took Over Dressrosa
We all know that no one was a toy before Doflamingo appeared, and Rebecca's father was turned into a toy the day Doflamingo successfully carried out the coup. In the following panel from One Piece Chapter 721, we see Rebecca's father, with both his legs present – he also has a coat covering him. We already know of his appearance, why hide it?
Also note the wordings, "Who's this shrimp!!" – they do not say "who is this toy" or anything alike. There can only be one reason to hide his appearance back then, the readers aren't supposed to know whats under the cloak. After his little fight against Doflamingo's crew, he lost a leg as well as was turned into a toy, after which Rebecca completely forgot about his existence as her father. The Toy Soldier also knew who turns people into toys, he stated that the current "location/position" of Sugar was informed to him by the scouts, but he originally revealed that Sugar is the person turning people into toy's, he also referred to the user as a "she" before actually taking her name.
Leo Mentions Toy Soldier As "Captain"
We know that the Tontatta Kingdom has it's own army and hierarchy – and Leo called Toy Soldier as "Captain"
While he could possibly be given the "Captain" title as a honorary title for being a part of the rebellion, I think he was originally a officer of the Tontatta Army and that is his rank within it.
King Riku Didn't Accept Scarlett's Relationship With A Dwarf
If we consider Scarlett as a daughter to Riku, maybe Riku didn't accept that she had a relationship with a Dwarf (and marriage). He didn't see her as her "own" daughter anymore. However nice King Riku was, I could see him getting upset over something like this. He loves Rebecca, yes, because she is her granddaughter and also a human, but I think in general he didn't accept Scarlett and Toy Soldier as family once they decided to marry. Toy Soldier also ignored Usopp's direction question to him, and didn't reveal if he was actually Riku's son or not.
Toy Soldier also said "Viola at that time was the princess" while speaking about the past, let's do some basic math. Scarlett was definitely elder to Viola, she had a child, meaning that Scarlett had to be the "princess". But if we presume that King Riku didn't accept her anymore after she had a relationship with a Dwarf, Viola being the princess makes sense.
Rebecca's Speed Trait
Speed is seen to be a trait of the Dwarves, Toy Soldier trained Rebecca. Rebecca is known for her "speed", the imprisoned gladiators were surprised that Rebecca lost in a game of speed against Luffy. Luffy has gained that speed via training, and his Color of Observation Haki gives him a upper hand, but what if speed was in Rebecca's genes? Due to her father being a dwarf, she inherited speed naturally and can grow a lot more in speed.
This is all speculation after all, it can be right, it can be wrong, but for now this is what I think :p
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