I would have to manually add each avatar to each person.

I already have to do that for the O.G. thing, but I'm okay with that because there are not going to be a ton of them.

I'm definitely not going to do it for the 100,576 HaloWars forum accounts.

The HaloWars forums weren't built with Avatars in mind, and the only stock options that come with it are Upload your own (which we are absolutely not going to do) or none at all.