I knew a kid that got picked on a good deal because of his weight. However it always amazed me that he would take it and be afraid to do something about it to defend himself. See he was fat, but he was also very big for his age. By that I mean he was a little taller then his own age group, he had very broad shoulders and you could tell that even under the fat he was what we call big boned.
I used to tell him to stand up for himself but he would always be afraid. Used to defend him at times when others went too far.
He was a few years behind me in school. I left to go to the Army and sometime in those years he lost a bunch of weight and did not take anything from anyone.
Sadly he went to far to the extreme. Instead of standing up to bullies and defending himself, he himself turned into a bully and picked on others.
I saw him some years later and asked him if he remembered how he would be afraid. How he got picked on. How I told him to stand up for himself. How on occasion I would defend him and of course he did. Then I told him if he remembered all of that, why did he turn into the type of bully he used to despise and to think about how those he picked on felt like he used to.
I don't know how long he continued that as I really don't think I have seen him but 2-3 times in many years and just in passing at that.
But I have heard that he got married, had a little girl and turned into a pretty good family man that was neither scared of people nor a bully to others. Hopefully that is true.