Personally i always felt after listening to the recordings in Lonesome Road that ED-E was a male, just my impression however

I guess its one of those open to interpretation things again, which seems to be a common theme in Fallout and TES haha

Well he did have a gun . . . down low if you know what I mean....

Why are you trying to assign gender to a robot? If it hasn't said it by now, assume it's identified as non-sixual or asixual.

I personally think that the dog will have little backstory, Codsworth is already part of yours and thus easier to include, and Preston and Piper already sound like they are going to be pretty interesting (they already seem to be on track to comparing to NV Companions). As for the other companions, I believe that the Pirate Ghoul, a Brotherhood Member (possibly Maxson if it's later than 2277), the Super Mutant you're fighting alongside in the E3 Demo, an Android, probably another female or male human (I think Maxson) or more, and I honestly hope an Alien stranded here after the Mothership Zeta was taken over.

12 is a perfectly reasonable number for companions, I expect them to learn their lesson from 3 and skyrim in their writing quality especially since both were heavily criticized.

Why do you care if i assign a machine a gender? I can do whatever i want

no you cant there will always be rules....

Actually Bethesda claims the companions have a lot of personality.

"We track how [each companion] feels about you," Howard says. "With the humans, it can even lead to romances and that is regardless of whatever gender you are playing. We spent a lot of time on this mechanic. They have a lot of personality. You can also play without a companion, and we have special perks for if you want to play as kind of a lone wanderer."

http://www.gameinformer.com/games/fallout_4/b/playstation4/archive/2015/07/24/fallout-4-quakecon-presentation.aspx?PostPageIndex=2

What about Veronica?!

Nevermind she just died because she tried to fight 7 Cazadors.

She's cool though, give her a dress and get a nice perk to fist people with.

Only in your mind, are there rules my apprentice.

Not to mention how she can wear power armor! I always put her in Enclave Power Armor because it degrades too fast on the courier. That, plus equipping her with greased lightning, makes for a brutal companion combination.

Aww Veronica just wanted to give them a friendly punch!

http://www.nexusmods.com/newvegas/mods/searchresults/?src_order=1&src_sort=1&src_view=2&src_tab=1&src_language=0&src_cat=73&src_showadvlt=1&page=1&pUp=1

There you go, 42 pages of companions and companion mods so you can find what you hate