Wow, Wuk Lamat is really single-handedly ruining the DT story...

[Voidmage]

He's bad in the same sense of most other DT's character is bad, the narrative barely tell us anything about them. We know he was a strong and wise character which demonstrated through his feast. But how was he as a ruler, we have a 80 years gap with literally nothing to fill.

You are correct that we aren't told that outright but that is one of the few times that's actually not wrong in my opinion.
We can just look at all the people there. None are unhappy, the borders to other continents were opened and he installed a big Aether crystal network.
His rule seems to be full of building up a peacefull town, safe country and technology where it benefits the people.

If anything I would say we know more about his rule then about him being a father.

First, I think that's because he's actually pretty empty. Second I also disagree about he's not a trope, he's actually one of the VERY typical one. The super-cool character who is also designed to die to either make room for or push the rest of the cast. Top of my heads let's see ... Duncan from Dragon Age Origin, Mother Queen from Suikoden 5, Jeralt from Fire Emblem Three Houses, General Ouki from Kingdom, and a lot more. Seriously, he's the type of character that after 2 interaction I was like "yep, this guy gonna die, soon".

Here is one of your (J)RPG 101: if the parents of an important character appear in the same story, there is a good chance the parents are there to die. And the cooler the parents, the higher the chance of that happening. It's very old formula.

Nono, you missunderstand me. I'm not saying he as no tropes. I'm saying he deosn't feel like it.
Yes he is the cool old dude trope like you mentioned but he is actually more then that like in my first point.
He was a good ruler and a father who loved his children besides trying his best to make a new dawnservant.
He also was someone who was not afraid to use his strenght to unify people but also knew when to talk things out.
That's not just one single trope.

On your examples:
Duncan was actually far deeper then that and kinda dark with his "grey wardens first" approach and Queen Arshtat was a loving mother who was manipulated by the sun rune. Both are far more then their tropes because they use those to make the character liek Gulool JaJa.
I agree on Jeralt though (hate three houses anyway). A better example would have been Ikes father in my opinion.
Those characters were not defined by their death but by their way to it and what they left behind after it.

I know quite a few "children" who love their parents very much, whether they're well adjusted individual though ... I don't think the metric you're using are accurate nor reliable.

Sorry but this here I don't understand.
You are using psychological problems here. Gulool JaJa was absolutely not an abusing parent or something. He clearly had the best interest of his children in mind and was even as only the head of resolve the most level headed character in the entire story with a bit of "I like to fight strong oponents".

I'm not gonna say you're wrong but you don't know that it's true either. And this is the problem, we're trying to fill the gap with conjecture because the narrative doesn't tell us anything.

Of course not. It's all just a theory because the writing sucks in DT and doesn't tell us anything but so is the whole debate about Gulool JaJas character.

The worst part of this is how "laughable easy" we were able to solve this 80+ years issue when we arrived. Gulool Ja Ja reached out to the Krile's grand father while Konoa essentially went for a full scholarship, this show they're well connected and aware of the Sharyaland capability. His right hand man stayed in that forest for 80 years, and were a world renown seasonal adventure ... and you tell absolutely no one were able to come up with such a simple and obvious solution? The whole super baby thing is like jumping to the letter Z to solve the issue while ignoring all the ABC before that.

I completely agree with you here.

Also you can read Papayatar's reply right above for further explanation why this story is a really bad reflection on Gulool Ja Ja

I know I just don't reply to everything, I don't even disagree on him having made mistakes or wrong turns.
I just harshly disagree on the notion that he was a bad ruler and bad parent because both things are told to us by the characters ingame to not be true.