Neither of these Queens of Arendelle are straight.
SAPPHIC QUEENS FOR THE WIN!

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Neither of these Queens of Arendelle are straight.
SAPPHIC QUEENS FOR THE WIN!
Bisexual flag colour-picked from North Mountain Anna.
A flower from a queen.
I saw this ship pretty often recently, but haven’t see any fanart about them.
So here it is. An Annamaren! Sorry for the sloppy art, recently learning photoshop and it’s past midnight on fever. Phew.
We all already know it, Olaf.
Imagine a day when Elsa goes out into the town and meets a lovely girl. She is instantly smitten with her and much like every young sapphic woman in the kingdom, the girl is already head over heels in love. The two are instantly inseperable.
And so that very afteroon, Elsa decides to marry her new love.
In the royal hall, as she waits at the altar for her bride, Elsa has a very puzzled Anna acting as her maid of honour. Her sister only has one question.
"Hey! How come you told me off for wanting to marry Hans when I first met him yet here you are, marrying a girl you just met today!"
Elsa giggles. "Oh Anna... I told you. You can't marry a man you just met. I never said anything about marrying a woman you just met. See... women are a lot more honest than men."
Anna... gets very embrassed at how obvious it all is. And then, Elsa's bride walks down the aisle, looking absolutely perfect. As Elsa unveils her bride and shares their first newlywed kiss, one thought goes through Anna's mind.
She want's a wife too!
Some aroace Elsa text posts, with bonus bisexual Anna
Actually I do have canon evidence for bisexual Anna:
Checkmate heteros.
Consider: Anna is bi as hell but it takes her a while to realise it because she’s grown up only reading straight love stories and hasn’t spent much time with girls around her age other than her sister. And then one day she has the epiphany of ‘wait... I can like women too?’ and never looks back.