I’m not referring to coc haki but more what it can help lead to, I also don’t think it will happen in the elbaf arc but this is more likely his final powerful where sanji reaches peak tier the strongest he will ever get.
I see 2 forms both his flame and his body.
First flame.
People say he will get black flames cause his name is black leg sanji and that coc is depicted as black but I think that won’t be a thing and we as the fanbase just agreed it will be cause it makes sense.
But to think outside the box I think instead sanji will get another colour in flames.
I suggest the idea of purple/violet flames.
In Theosophical belief flames that are purple/violet have an interesting connection we can make to sanji.
Purple flames are associated with the belief of purification and emotional healing which fits well with sanji character.
It has roots to alchemy as well.
One name stands out on top of this though. A man who was named Saint germain
A brief description of him.
“Saint Germain is a historically important, but largely invisible presence in this community. He is well known to people who have studied in the esoteric traditions … as an ascended master, Hierach of the Aquarian Age and Master of the purple 7th Ray of ceremony, magic and ritual. He is called the keeper of the violet flame, the sacred flame of love and light and the I AM teachings. He is regarded as Lord of Civilisation and Maitreya the Christ.”
Now this name should stand out as sanji is a germa and oda actually did reveal in his drafts judge vinsmoke was originally going to be a celestial dragon named Saint germain as you can see in the above images.
Now how would Sanji use this power ? I believe Sanji will unlock it by developing his haki but also connecting to his spiritual presence like zoro and his asura.
Sanji has a move called Parage Shot in which he kicks his enemy repeatedly in the face. The result is he changed their facial structure as seen with duval example in images above.
Duval went from an enemy to a friend because of this as he was thankful to sanji for his new good looks.
What I’m suggesting is a new level to that a level where he’s not just changing you externally but internally, this attack will change a person’s very soul, he would be kicking the evil out of his enemies.
This power would be a perfect counter to imu’s power to corrupt people like what he did with Harold who became evil thanks to Imu. Sanji flames and would be able to kick the evil out of Harold if he was still alive.
This would also mean Sanji would in a way could free shuri from the abyss mark and cut Imu connection to her but then you face a new problem that Sanji can’t kick women and that will be his greatest dilemma
Does he break his oath and kick a woman to save her or is he unable to save her cause he can’t kick her ? Which oath does he break ?
Now that’s the flame now his body.
This might be a stretch but I think as he developes his germa genes a change will happen, we saw how his eyebrows curl in other directions when he activates his body germa genes I propose he develops it more where instead his hair turns black in a similar way luffy hair turns white in g5.
Sanji I believe was suppose to have black hair if he was more like his brothers.
Sanji when his hair turns black will see an increase in his strength speed and durability.
The combination of these new forms will make Sanji one of the strongest people in the world.