There are a few instances where Edward is influenced by external factors, such as:
* The Philosopher's Stone: While not technically a possession, Edward does rely on the Philosopher's Stone for a period, which does give him enhanced power but also compromises his morals.
* The Homunculi: Some Homunculi like Lust try to manipulate Edward, but he ultimately resists their attempts and remains true to himself.
Edward's character arc is about overcoming challenges and making difficult choices. He faces many temptations and pressures, but he never loses his sense of self or control. He is a strong character who uses his knowledge and skills to fight for what he believes in.