Design traps I sincerely hope they avoid with Syndra
- Insanity/megalomania just because she is powerful.
Syndra is a powerful personality, but within the expectation of being unbound from her society's 'oppressive' norms. She isn't of the mind to bend the knee (arguably, in any situation), and pursues her own agenda with a strong, if disregarding of others, purpose. One could argue her sovereignty is not skillful nor built to be a ruler of the state (compared to someone like Jarvan IV and pre-rework Karma). The learning experiences of the state, as much as her own role in Ionia and how to utilize her power, constitutes a hefty part of her early 'human' journey.
Delving into the 'absolute power corrupts absolutely' yadda yadda trap---there is no compelling reason to make her go bonkers simply because she is powerful. Nor should the pursuit of her own power make her go off the deep end. Being of a sound mind, if culturally different, is important to making sure she's wholesome at every level. Otherwise, literally every other idea built on her falls apart.
- Her power is her own, and not one she steals from others, or recklessly pursues 'dark arts'.
Exploring her power, understanding who she is as a person, and what she can do as a mage, forms a lot of Syndra's core character story. Absolute/infinite/universal power by itself is, inherently, boring as hell. It's a god mode idea, you win, woo. The reason why someone like Superman can be interesting is because we see the human conflict of what Superman does with the vast power at his command. Similarly, observing the human struggles Syndra has, and the reconciliation she must make with her ambition to 'transcend', is what interests us. She has the built in potential to become something more, so taking power from others is just cheating the drama she could have.
The moment you strip her agency away (it's not her magic, she's insane, she's some voidlings puppet, [janky theory of your choice here]), you invalidate her design premise. Literally nothing about the character matters at that point, she's a throw away goon.
- Culture abandonment just because she's 'different'.
She is still very much Ionian, and things like Ionian pacifism/spiritualism will be dear to her. She won't change Ionia into another Noxus, but she very well might make it a fortified nation that is more starkly aware of what it can do. That depends on how Ionia is doing when her personal story is progressing, though. Karma's main story is being a major Ionian leader, and she will be the primary conflict in how the two of them decide the nation's political future, I think. The back-and-forth here has potential, but I digress.
Similarly, inoffensive Ionian ideas (tea? tree gardening? meditation?) are very likely to be apart of her from her upbringing. Adjustments to the things she hates about Ionian culture will be what draws differences in her way to everyone else. It's important to make her still apart of her people, in some way, and not something by itself just because. Ionian in spirit, if different, as much as form, if you will.
Thank you for reading! If there's any other female power fantasy trope traps you might be afraid she could fall into, let me know! I just covered the three big ones, as far as I could tell, at least.