The Vinsmokes are all about evil science and technological wizardry, but it seems there's one Vinsmoke offspring who still has the same heart that Sanji has - that of a human's.

In "One Piece" chapter 840, Reiju Vinsmoke was depicted as someone who genuinely cared for her bullied brother but she doesn't have the courage to stand for him. At one point, Reiju was seen fixing up Sanji's wounds after he was beaten up by his other brothers.

Now that they're grown-ups, will Reiju display the same attribute of love and humanity? Recent rumors suggest that "One Piece" chapter 841 will see the Vinsmoke brothers in a fist fight just like how they were when they were kids. Reiju will proceed to the Vinsmoke patriarch's room and inform him about her siblings fighting.

As already known of Jajji, he won't care even if Sanji gets beaten to death. However, Reiju will calmly remind her father that Sanji is set to tie the knot on the same day with Charlotte Pudding and if anything happens to Sanji before the wedding ceremonies kick off, Big Mom may get disappointed, cutting off the much-coveted alliance that the Vinsmokes desire to have with the Charlottes even before it starts.

Will Reiju's caring character sink into Jajji and the other Vinsmokes? Will she have enough courage this time around to stand up for the weak brother she really cares for?

Meanwhile, it is also speculated that the revelations about the Vinsmokes will start getting more in-depth in "One Piece" chapter 841. Some believe that Sanji may discover that he is either of these two on-human developments: a clone of his father, or a being who was originally human but has been enhanced through technological and genetic innovations.

Will this big reveal be enough to awaken Sanji's true strength (if he has hidden capabilities which have yet to be disclosed) or will a character death be needed for Sanji to realize that he can actually defeat his siblings and potentially his father?

If there's one death that may possibly be depicted in "One Piece" chapter 841, it would be Zeff's. As seen in chapter 839, Jajji showed a photo of Zeff to Sanji, blackmailing him that if he does not submit to his father's desires, Jajji can easily chop off the Cook Pirates' former captain.

Zeff is Sanji's beloved mentor and it's impossible that Sanji will not unleash an unseen fighting level if Zeff meets his demise in Jajji's hands.

"One Piece" chapter 841 is expected to be out next week.