- Sabo's hairstyle is more Ace's, but he covers one side more (due to the scar), just like Sanji does with his eyebrows. - Sanji's initial name was Naruto, while Sabo shared the same Voice Actor as Naruto. - Similar favourite food, Sabo's favourite food is Ramen Noodles (another reference to Naruto), whilst Sanji's is spicey seafood pasta.
Sanji doesn't let anyone go hungry and Sabo works as a revolutionary. Family Method to Power Both families also employ an identical method in order to cement their power: Marrying off their son. One main difference between the two, of course, were the ages of Sabo and Sanji respectively when the plan was formed.
Both had something destroyed by their fathers when they were young (The drawing Sabo had made for his father, the food Sanji prepared for a mouse). Both had pirates involved in their return to their royal status (The Bluejam Pirates for Sabo, the Big Mom Pirates for Sanji). Both were locked up by their fathers for showing disgrace.
This may have been brought up before but sabo and sanji are like the same people there both male there both blonde they both were part of noble families that they hate then they ran away from said family and ended up with luffy they are both well dressed they both have their own unique martial arts style that they later learned to incorporate with fire the similarities are insane. In Sabo's case, while his blood kin thought him a disgrace, his father's solution was to trap him in the family home and try and force his ideas on him. While similar to Sanji's father (from what we've seen so far), the difference is that Sabo's father saw worth in getting Sabo back BECAUSE he was related by blood.
Sabo's existence was hinted at by ace's tattoo, specifically the crossed out s on it. It was revealed that if Sabo had never "died" Ace's tattoo wouldn't have that. For Sanji's case, the most blatant thing is that he was from North Blue, yet he somehow got to East Ble without entering the Grand Line.
He also referred to himself as Mr. Prince in Alabasta, though whether or not. Sabo was born into nobility in the Goa Kingdom, but his upbringing was far from ideal.
His parents were more concerned about their financial and social status than their son, making Sabo feel like a burden. This led him to run away from home at the age of 10 with dreams of becoming a pirate and writing a book about his travels. Now, to be clear, before I go about pointing out similarities (such as Sabo & Sanji's affinity to fire) and the like, I am not in any way implying that the two are in identical situations.
Their circumstances are different, family structure and strength are different, and even the characters ages at the time are different! I just noticed a similarity in their circumstances. Sanji is already flame-resistant and his blue fire should be hotter than any fire Sabo's shown. Whether Ryusoken is a better martial art than Sanji's Black Leg or whether Sabo has better Armament are both pretty subjective takes.
Both had pirates involved in their return to their royal status (The Bluejam Pirates for Sabo, the Big Mom Pirates for Sanji). Both were locked up by their fathers for showing disgrace. Oda has revealed how Sabo would look at 40 and 60 years old.