Items and Weapons
Shown here semi-transparent, only halfway materialized over Seiya's face. (Look! You can see his ear!)
This neat-looking microphone appears to serve no purpose, although it seems to be an important part of the Starlights' henshin sequence. It materializes at the start of the henshin sequence, but it disappears when the henshin is completed.
Other than during the henshin sequence, the Starlights wear the
microphone three other times in the anime:
1) during their introductory speeches,
2) during their first live concert in Tokyo, and
3) during their appearance in the opening credits.
The brooch appears during the henshin sequence, and is worn at all times on the outside of the Sailor fuku, nestled right between the breasts. It is a gold, five-pointed star with wings. In the anime, it appears to serve no real purpose other than decoration. However, in her notes for the Materials Collection artbook, Naoko Takeuchi stated that the Starlights' Sailor Crystals were held inside the brooch. So the brooch protects and encases the Sailor Crystals, serving the same function as the various brooches that Sailor Moon wears.
The brooch is probably the true henshin item of the Sailor Starlights (not the microphone described above). It is definitely used that way in the manga. And in the anime, in episode 188, you can see Seiya reach into his pocket and pull out the star brooch, right before he is about to transform into Fighter.
This is the weapon that the three Starlights use. It is used in all of their attacks, and it looks like the energy of the attacks actually emanates from the Star Yell itself.
Interestingly enough, the Star Yell never appeared in the manga. It's a strictly anime thing. (It was probably created solely so that TOEI could sell the toy version of it.)
Item names. The "Star Yell" is named as such both in the deluxe Sailor Stars anime artbook and on the packaging that Bandai uses to market their toy version. Actually, both the Bandai packaging and the anime artbook name it as a "Sailor Star Yell," but I think it's perfectly acceptable (and less silly-sounding) to shorten the title to "Star Yell." The henshin microphone thingy is not named in the Materials collection notes, and the brooch is only labeled as "brooch." (Although a common fan term that I like is "Star Brooch.") Ian Miller pointed out that Bandai collectively named the henshin microphone AND the brooch as the "Sailor Change Star." You can see the label of the toy package here.