Will somebody arrive mid-fight to seize The Gate?

[Kardwill]

Yeah, anyone using Kraagor's tomb as a convenient shopping mall is crazy strong.

Maybe not "Take down the campaign endboss by themselves" crazy strong, but definitely not pushovers.

Hence why I said "looks stupid" instead of being one.

Thing is, she doesn't look stupid? She is pictured as perceptive, doesn't let RC bull**** her, never does anything stupid nor shows any lack of thought.
Yeah, she and her warg speak common in a weird way, she's brutal, and she tends to be focusing ont the "now". But her speach could simply signal they are not native speakers. IIRC, we never "heard" Oona talk to another tribe member.
Although I agree that it can create expectations for both the people interacting with her, and the readers, since it reminds us of Thogspeak.

The main thing that might create that "stupid bugbear" perception are that we actually often see her through Redcloak's prejudice : Despite all his talk about Goblin Dignity and his epiphany during the Azure City Battle, he's still patronising, or even nasty, in most interactions he has with goblinoids, as if they were not equals but just children too stupid to understand what needs to be done. As a mere bugbear with a martial class, Oona gets the same treatment.