Grumpy Warrior

So a friend of mine (Things with Wings) said the other day that the grumpy warrior is my patron saint. This trope is resonating with me particularly lately. With chronic pain I'm frequently grumpy, but I still want to do the right thing. And I have to keep going, there's no choice.

Examples of this trope are:
MurderBot,
Eliot Spencer,
Bucky Barnes,
Wolverine.

Do you know of other examples?

eta: Sarah Connor