Are we frogs? Are we not Knights of the Spiral Realm? Then give us costumes (like other game sites do) that declare a gender, and put an end to our pronounless existence.
Mawashimono seeks and end to our androgynous tyranny!
Personally, I prefer playing a genderless robot with a (possibly trademarked) name that implies gender.
Just consider them all men, and men who dress like girls.
Solution presents itself
I suggest the pronoun "it" or the unofficial neuter pronoun "e."
You can choose the twin tails helm if you want. Maybe a flower. We pretty don't know much about Knights. They may not have genders at all.
Armor is meant to protect, not accentuate secondary sexual characteristics.
He/she/it wants a girly costume to be able to scream 'I'm a lonely innocent girl on teh internetz' and get attention in Haven.
Each color of Knight is a different gender. Knights don't have the same reproductive systems that animals on Earth do, it's a lot more complicated! Like, Orange Knights find Lime Knights -extremely- attractive.
Well they have to have genders considering some of the knights are considered "Hes" or "Shes."
Cool story bro.