No, not as much as the game forces him to be with Anora or the DR
And even so, it's okay if he is spineless so the player can impose on him spouses, sexual partners and even children ? REALLY
Bi, because playersexuality is a fever dream.
Being well written, IC or realistic does not mean good, kind or merciful. Darkspawn killing everyone in sight is brutal, but accurate
That's why Anders not mentioning his past relationship with Carl to fHawke was made so a player can think he is straight... Oh, and doing stuff due to lack of resources like reused caves, enemies falling from the sky and player's choice not mattering in the end...
Ah, DA2, so fun to make fun of