Fudge was the one who nominated Granger to the position in the first place, under pressure from everybody who knows anything about anything. (Fudge had resisted nominating Granger because of zir unconscious attitudes about Muggle-borns and, to a lesser extent, young people.) Fudge feels like that means Granger owes zem something, so Fudge is slightly irritated about Granger doing something that disrupts the
move along, nothing to see hereorder that Fudge values.
Shacklebolt doesn't like confrontation very much, so ze isn't saying very much. Ze supports Granger, though, because ze has a lot of respect for a person who has clear goals and is willing to fight for them. (Incidentally, my version of Shacklebolt was in Slytherin when ze attended Hogwarts.)
Crouch and Thicknesse are sort of the antagonists here, but they're distinct from one another: Crouch has a strongly held ideology of
bad people should have bad things happen to them, while Thicknesse is trying to advance zemself and fulfill a role. Crouch thinks what Granger is doing is morally wrong, while Thicknesse opposes it because it's unconventional and inconvenient. (This is also why Crouch speaks in yellow and Thicknesse speaks in grey.)
Amelia Bones happens to disagree with Granger about priorities; ze agrees that it's bad for Dawlish to violate policy, but ze thinks it's insignificant compared to the value of having Dawlish on the team. However, ze also thinks it's not usually zir role to interfere with the decisions of the Heads of Office; ze is more of an organizational leader than a dominant one.
Arthur Weasley, Head of the Misuse of Muggle Artefacts Office, perked up when ze heard someone mention a
Muggle pen, but then went back to sleep when it turned out to be a false alarm.