Okay, so I let this one slide for certain fanfics.

When they Beyblade name doesn't match the characters.

Valt
Valkyrie

Shu
Spriggan

Daina
Deathscyther

I get really annoyed when it's something like this:

Kirien
Pandora

THE NAMES SHOULD MATCH

Unlesss it's a hand me down, it should match, but nooooo it doesn't! I hate this so much. It annoys me to no end.

And another thing:

The add-on comes BEFORE the name.

Pyre Pandora

NOT

Pandora Pyre

If you want to name your character's beyblade after a legendary or mythical thing, look it up on Wikipedia. Where do you thing I got Despoena? Not history class that's for sure. (We spent like two weeks on Greece -_-)