You know what’d be a brilliant AU for fanfic writers who don’t like Liara?
Trade her in for her dad.
Aethyta realises something horrible is going on with her ex, tries to help out, and this leads to her joining your crew (she may or may not need rescuing).
Some kind of loyalty quest where you rescue her kid from a bubble. The kid is nice and sweet and loves Prothean studies and just isn’t cut out for combat, and you help Aethyta get to know her and then send her back to Thessia where she’ll be safe.
Does Aethyta mess with your brain to help clarify the Prothean vision? Maybe? It’s not like she’s any less qualified than Canon!Liara is! Or honestly, it’d make just as much sense for the vision to be clear to begin with, and for you to explain it to her using your words.
Can’t snap Benezia out of it for more than a few minutes, but that’s long enough for her to give you information on Saren. Aethyta helps shoot her. Aethyta gets drunk and cries on you and swears revenge.
Miranda steals your corpse on her own, without asari help. Meanwhile Aethyta runs off to Ilium, gets in touch with all the old friends she’s made over the last 900 years, starts gathering information and spreading rumours about upcoming war because it’s the most useful thing she can do... and then beats the crap out of the Shadow Broker for [insert good reasons... ooh did he kidnap Liara?]. With her fists.
I don’t think Aethyta’s scientifically qualified, so the kid can help design the Crucible.
Can Aethyta be your girlfriend? Eh, why not? I’d be interested! So she’s elderly - so what? You’re both mature adults so that’s just a minor bit of weirdness.
Aethyta would be SO MUCH FUN as a representative of her species :-) I’m generally pro-Liara myself, but I would absolutely still read that!