"Who to get" Ultimate FAQ

I see a lot of frequently asked questions, I'm hoping this post is enough to answer everything.

Assuming you REALLY like Aventurine and want him above all else, your priority should be:

Aventurine -> Ashveil -> Aventurine E1 -> Aventurine E2 -> Aventurine LC

If you want a solid basis first (this is also the PURELY OBJECTIVE best line for Aventurine, Ashveil is rerunning so he will not be back as soon as Aventurine):

Ashveil -> Aventurine -> Aventurine E1 -> Aventurine E2 -> Aventurine LC

Robin is technically his BIS. But Mortenax Blade is not a substantial amount behind (if at all), so if you care about maximizing his damage, Robin > Mortenax. But if you have Mortenax Blade, you don't need Robin.

If you already have AshBlade and want to maximize their damage, Robin > Aventurine. If you want to have a strong Elation DPS (even if you use him in FUA, he still can benefit from Elation buffs), Aventurine > Robin. It's nearly impossible to compare the two because Robin is a support, meaning she will outlast and be more flexible than Aventurine in every way. But in terms of this team, it all depends on who you want to be the main DPS. Robin > Aventurine at full E0S0, Aventurine > Robin at any eidolon level increase.

E1S0 > E0S1, and E2S0 > E0S1.

TLDR, Aventurine Eidolons > Light Cone, Ashveil > Mortenax = Robin.

Correct me if I'm wrong in some parts, but this is the general consensus on what I see in this sub.