This movie was not very good
the good
Cast- great cast. Some of my favorites didn’t make it
the bad
Tiamat-why did Icarus want to make it more powerful when his endgame was destruction
Not sure if you are saying Tiamut's or Ikaris (correct spellings) had the endgame of destruction, but neither wanted that. Ikaris wanted the Celestial to be born, which would create stars that would eventually host trillions of sentients. That the population of Earth was to die was part of the circle of life, not in any way an endgame. They weren't doing it
for the destruction as you are putting forth.
Sprite-robot and then human? Why
Well explained that Sprite had for 7000 years been in a child's body, and treated as such. From the first scene with her where we see her illusionarily mimicking an adult woman, to the discussions on this. Including that she had been pining for Ikaris for seven millennia and he hadn't noticed, thinking her a child. Not really sure how that got missed, it was a point of discussion several times.
Black knight-if you don’t know then the audience is clueless
Yes, the MCU regularly puts teasers in their credits scenes you need to know. Like the first time we saw Thanos on this throne. Well established.
jolies character-makes a sword/shield as her power but she’s unstable the whole time? until she’s not
Characters develop in stories. Thena pulled herself together to kill the Deviant who had killed Gilgamesh, her beloved (platonic or romantic) of millennia.
Icarus can wipe the floor with the rest but needs to feed Tiamat. Even his friend is like why
Again, a plot point that was covered multiple times. Tiamut needed a critical number of intelligent minds in order to be born.
Thanos brother cameo-really that his brother.
Yes, really, from the comics, that's his brother. Eros/Starfox is a bit of an idiot in the comics, it's a good representation of him.
Basically, all of this was explained in the movie. I completely understand how not comprehending these things would make the movie less enjoyable, not too sure where you got some of the ideas though like the endgame was destruction. If you watch the movie again but paying attention it should be a better movie.