Except those are all examples of personality, Grunt's personality. Those are all the visible qualities he projects upon us in our interactions with him through Shepard. Alternatively, using personality to indicate his overall collection of qualities would be exemplified by something such as "Grunt's is an aggressive personality with a hint of wonder and/or amazement." And then, as listed, they work to make personality synonymous with character. So evidently they work with personality "in the proper sense of the word," whichever that was. Unless you were going with personality indicating celebrity status, and then yeah, my bad. Grunt's not much of a celebrity.
Thinking that a character is not supposed to have any personality is silly. I mean, maybe a robot, but even Johnny 5 had a personality. Why? Because Johnny 5 is a protagonist character and we are supposed to care for him, and caring for something generally requires personification, which I'm thinking is probably related to the word personality. Johnny 5 also had a mohawk and an eyepatch at one point, and then he got really golden like Super Sonic. Those actually aren't requirements to care.
It probably is possible for a person or character, potentially, to have zero personality and be capable of emotional depth. Lots of things are possible, potentially. I could potentially blow up the world. It's probably not going to happen. Two problems arise with this: one, I've never met someone with zero personality. Ever. I've never heard of someone with zero personality. The monotone professor who drones on and on and on is the closest I could conceive to having no personality, and yet he'd have personality. (Or Jacob. But Jacob has personality, too. The PRIIIIIIIZE.) The second problem is, who the **** would want to read about someone who has no personality, or meet someone with no personality?
Grunt, on the other hand, has little emotional depth. He's not going to be the krogan reading poetry to his asari girlfriend. He's not going to get misty-eyed if the time comes that he and Shepard are on opposite sides of a battle. That also would not upset him, anger him, or enrage him. There is a sense of belonging to becoming Urdnot, but it's less a sense of yearning or need and more because it's what should be. Simply, Grunt is - Grunt is Krogan, and that's that.
But the personality is there, oh yes. Because if it wasn't, he'd be flat, and nobody would like him. Like how everyone looks at Jacob.