Ichiji Vinsmoke

When Ichiji,Niji Sanji and Yonji were all children...they were happy. Ichiji would carry Sanji around and call him "little sparkplug" Niji would tease Sanji a lot and mess up his blonde hair.
But after that fateful night where Sanji was around 8 when he was dragged screaming away from Ichiji and locked in the cold dungeon,the sounds of his brothers screaming far away.
After that his brothers were emotionless and cruel. Ichiji didn't really partake in the abuse,but he didn't stop it.
There was in implant Judge had put in their spine to neutralize humanity and make them get powers and be highly enchanced.
Reiju had helped Sanji escape...but he never forgot the cold look in Ichijis eyes...in place of the affection one.
When Sanji returned years later at Cake Island to have an arranged marrige with Pudding,it was the same until Ichiji actually let him escape.
A week later...Sanji had decided to come back to get his brothers back. ..the real ones.
Starting with Ichiji.
When Sanji reached the dark,highly dangerous cell...there he was.
Beaten to a pulp. Sanji knew it was probably Judge. ..again,for Ichiji letting him escape.
Ichiji didn't look up...but those dark crimson sunglasses lay shattered on the floor,revealing blue eyes just like Sanjis.

Sanji came to rescue Ichiji and get his old big brother back.