She can turn into a futa or a fatso and she has a futa GF who’s her primary, while you’re just a side-piece.
She turns into a Huskar which is more chubby but she doesn't go futa (she does have strap-ons)
Huskar!Anno on the left, normal Anno on the right.
The transformation is Reversible after a week unless you give her more treats.
And you can fuck her main partner Kaede (not that neither of them mind) and really you could argue it ends up becoming a weird open-relationship throuple with you, Kaede, and Anno, hell Kaede even starts poking fun at this.
And I believe the reason she's not hated like Cait, is because Savin doesn't shove Anno into every single quest and encounter. And she acts as a shop if you recruit her, which is another positive over Cait.
Another thing is that Anno is pretty damn open about being open relationship
and how she is already dating someone, while you aren't her partner per see Anno still trusts you a lot and likes you, it helps that Kaede is the same thing and doesn't really mind it at all, and you can often just join in the fun yourself (and she pretty much nudges you to do that in most cases)