I think in 'Customize' you choose which character to appear on the main menu (in this case it's Jak), the theme (in this case it's Radec's theme), and the color (in this case it's orange).
I assume you'll get to customize your unlockables too (Intros, Outros, Minions, Belts, and others).
That's NOT Radec's theme, it's all Jak and Daxter.
I don't really like the menu... I think it's a great idea to put the most played character there, but the menu in itself looks straight out boring in my opinion... It's like if they didn't put effort in the menu.. It's basic and that's not really bad, because it's clearer then.. However, if I compare this to the stages, characters etc. Then the menu could have been made way better.
I hope that this isn't the final menu, but I think it is since it was the final build I think.. :\
Looking at it again I think Smash Bros. needs to take note because online matches against anyone that isn't on your friends list didn't allow you to change the match type in Smash, you were just left with a free for all, looks like here you can actually pick what you want, more online freedom then which sounds fantastic, though I do wish they gave you the option to set it to 1v1 and 3 player fights but it's no big deal.
not a fan of orange...or how plain it looks.
fun fact,the hue Orange is a natural sexual stimulant
I thought that was red.
The background is incredibly boring... I like the idea that the characters show up randomly, but seriously, the background could have been a lot better, at least they should put the stage of the character