Be sure to apply ModMiiFix.bat that can be found on page 1, this should fix most of your problems, except the hackmii and bootmii part, as those sites are still down it seems.
Cheers,
Johan
@Xdqwerty, to answer your question, they're a fusion Brit-pop/J-pop/electronic band with a woman vocalist. Flamingo is hands down their best known song but they've got a ton of other really good songs