Yeah, if you go through all those names again then they'll know who you are, if they knew you during those phases. When you come up with a new name it makes thing more difficult. Name changes is a very nice privilege. Many sites don't allow name changes at all.

Speed-running section? lots of players seem like they really enjoy doing speed-runs of old games in their free-time. maybe it'd be useful on the front-page with a link to their stream?

users should be able to recommend blogs yep

like button should be available

The images thing is a bit unnecessary IMO, you had better make some very, VERY clear restrictions about that.
If I want to one of the girls from K-ON, who is not 18, in a bikini on my front page that is completely PG, but some people might find that offensive. KON only used because of the <18 thing but I see the same problem with legal, more busty anime chicks as well. completely PG, and if it's offensive, that's their problem.

Also I find the "entertain non-brawlers" thing to be a little bit weird. ALLisBRAWL should feel no obligation to serve the interests of people who do not wish to use what the site is for, brawl related things. But hey, extra stuff, as long as it's completely optional and doesn't clutter the front page, has no issue with me.

I love this idea. Sadly, it's not that important for AiB when there's a site like SDA out there, but I completely endorse doing this.