Light Yagami/Harry Potter
If Petunia thought Light was going to live with steadily declining food at an important time of development for his child's body, then she was sorely mistaken. If Petunia wouldn't give him food, then he would just take some from Dudley.
All Light had to do was turn to look at Dudley, extend his hand and ask, "Give?" and Dudley would push over all the green veggies he disliked onto Light's plate. Light didn't even care if Vernon and Petunia saw this exchange. Dudley never ate healthy, tasteless, 'rabbit food' and Light was perfectly happy with all the squished green vegetables Dudley happily gave Light.
Dudley probably thought he was hitting two birds with one stone whenever this happened. He wouldn't have to eat food he didn't like, courtesy of Vernon's thoughtless remarks at the dinner table, and he would also gain his favorite cousin's favor. Light was all too happy to humor Dudley's antics whenever he wasn't hungry so it wasn't like Dudley was wrong in that regard either.
Petunia tried to stop Dudley from giving Light food and Vernon threatened Light from asking food from Dudley again. Neither of the children, one real and one fake, cared.
In short, in the Dursley household, Light Yagami had an all-purpose human shield by the name of Dudley Dursley.