Relationship between Sanji and Reiju
Out of all his siblings, Sanji has a better relationship with his elder sister, as while she did partake in laughing at him as a child, she only did so to avoid being bullied herself and tended to his wounds in secret. She felt enough empathy for him to free him from his imprisonment and even tearfully told him that he would meet people who would treat him better.
However, Sanji still showed disdain for Reiju when they reunited as adults due to her role in dragging him back to the family, and her attempts to show him the benefits of a royal life despite knowing what he went through as a child.
While watching him duel their father, she would be amazed with the strength and durability Sanji has gained since their childhood. Following his defeat, she would tend to Sanji’s wounds while voicing her surprise that he was the previous weak child that she once knew.
Though Sanji did not think much of her, Reiju treated his wounds after his brothers beat him once again and even questioned his choice to return.
After Reiju was wounded by Charlotte Pudding, Sanji felt obliged to tell his sister the truth about the Big Mom’s plan to assassinate the Vinsmokes. When Reiju told him to leave her and the family, Sanji was vocally against the idea as that meant she would die, showing that in spite of everything, he truly does care for his sister.
In response, a touched Reiju expressed that she was proud of his empathy, telling him the truth of their mother’s death and alleviating his thoughts of guilt for her passing.
When Sanji decided to rescue her and his family to get rid of his childhood grudge against them, and when it briefly seemed like he would not succeed, Reiju again expressed her pride in him for his empathy. She later expressed a smile after Sanji verbally disowned Judge again after he questioned the latter’s reason of liberating them from Big Mom’s clutches. As the Vinsmokes fought off the Big Mom Pirates, Sanji and Luffy quickly came to Reiju’s aid when Big Mom focused her attacks on her.
The few members that have been seen are amongst the most powerful pirates in the current storyline, with Rayleigh being referred to as being 100 times stronger than the eleven super rookies and able to fight Admiral Kizaru to a stalemate, despite being an old man. Shanks over the decades has established a reputation and obtained power, becoming one of the four powerful pirates known as the Yonko. Both he and Rayleigh display powerful Haki abilities.
Crocus did not display this, though it is not known whether or not he possesses the ability.
However, he was not a member of the original crew; he was taken in to keep Roger alive on their final journey. Despite not being an original member of the crew, however, he did display some strength as an old man, stopping bazooka blasts with his own body.
Kozuki Oden, a member of the Kozuki Family, was also a member of the crew and like his captain, was one of the few people known to possessed the ability to read Poneglyphs. As a result, the crew has not one but two people potentially capable of locating and reviving the Ancient Weapons as a result of their ability to read Poneglyphs.
Upon arriving on Zou, the crew was accompanied by the two powerful Mink rulers, Inuarashi and Nekomamushi, who have been shown to fight on par with Jack of the Beasts Pirates, who holds a 
O: Well I actually didn’t think anything of it. Before there was a staff member in our workplace who asked us something interesting. The wish to treat a woman older than you as if she was younger, and a woman younger than you as if she was more of an adult….Is Sanji acquainted with this feeling? I replied, “O, Ofcourse. That is right”
