All depends on the game.

Played Dragon Age as a Female, Mass Effect as a Female, Demon's Souls as a male, White Knight Chronicles as a Male, Wow as a Male.

Im pretty 50/50, i guess it just depends on the game and the character simulators.

Default character always. I hate meddling with character editors. For games with classes, I choose the one with the assault rifle.

Depends from game to game. Usually in MMO's like WoW I prefer playing male characters due to the look of the armor and voices, that changed a bit back in 2012 with Mists of Pandaria when I chose to play a female Pandaren Shaman and Female Orc Hunter.

Most games I'd usually play male but again it can vary depending on how each gender looks/acts.

I'm struggling to remember any section of Nier you didn't play as Papa Nier. Which was this? Are you sure you're not confusing it with another game?

I don't think I've ever felt truly immersed in a way where I felt I was in the game. Gender would probably not affect my immersion either way.

I prefer female characters.

Depends on how the genders are handled. If armor is armor for dudes but the same armor is a nightgown with holes in it for girls, male. If the female character switches impossibly hard ... in 4 inch heels ... on a battlefield... going male to avoid nonstop eyerolling.

Whatever gets me into the game faster

I'm a man but i like to play as a female in games except in Mass Effect

Used to play male exclusively, but now I alternate between the two. Generally, my first play through is as a male, then female on the second play through.

Male pretty much every time. Only times I can think of where I chose otherwise was AC: Syndicate (unless I was forced to play as Jacob) and Saints Row: Gat out of Hell (played as both for the achievement but played as Kinzie for the rest of the game after I got the achievement)