Edward isn't cruel to people, but he skips the small and gentle talks and gets down to business. He's not one to waste time sugarcoating something, no matter who he is talking to; and I like him for that, it gets people off their back ends and taking control. Rose was GRATEFUL for that. How often have people underestimated Ed, from all the comments about his size [while for humor, it can't be hilarious when its said so many times] to his abilities and heart? Likely, he's impatient and snappy because he's constantly having to prove himself to everyone. Plus, yes, he's a bit more tempermental and straightforward, and that's also his personality.
Ed's also older, and likely remembers more of his father. Al tends to be more passive toward the entire issue, whereas Ed has no problem revealing how bitter and angry he is at his father for what happened to his mother. As the elder sibling, he likely feels as if he has too, in addition to claiming responsibility for most bad things that occured in their lives.
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