Saaya's plushie is named Lionmaru!
They even interact sometimes:

-Hey! Your drumming's gotten rusty!
With a drumstick, Saaya whacks the mean (in her mind) Lionmaru-kun on the head with a *gochin*.

A homage to her seiyuu's nickname!
https://t.co/sJEDPudpAp

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Yamabuki Saaya Profile

"Santōryū“

Age: 15
Height: 159cm
Instrument: Drums
Likes: 3
Dislikes: Fire, rain

She performs with 3 drumstricks! She likes the number 3 because her birthday is 3/3 (today!!) and she has 3 triplet younger brothers (Riku, Kai, Kuu)!

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Ushigome Rimi Profile

"Shoeless {Barefoot} Ninja Girl"
Age: 15
Height: 150cm
Instr: Bass
Likes: Low notes, choco, cute things
Dislikes: Math and kanji

A ninja wannabe who sells rice to classmates to make ends meet. "My wish is to join Japan's No. 1 band!"

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Toyama Kasumi Profile

"Starry Charisma"
Age: 15
Height: 156cm
Instr: Vocals & Guitar
Likes: Star-shaped objects
Dislikes: Gossip

Her alias is the only one from Betadori that was retained, as seen in Pico S1E1, possibly as a homage.
Gossip makes her sad :(

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Today, 3/3, is BetaSaaya's birthday!

She uses three drumsticks! Her future nickname is "Santōryū“ (Three Swords Style), a swordfighting style where the fighter wields three swords, one in each hand and one in the mouth!

Garupa Pico's ED calls back to this!

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This was the first ever illustration of Bandori released to the public!!

It appeared in Gekkan Bushiroad magazine's Jan 2015 edition (released 2014-12-08). The original manga 「BanG_Dream! Star Beat」 started its serialization the following month.

[...]

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Why 300,015 yen instead of 300,000 yen?
According to Arisa, it's because Kasumi was 15 years old!

Afterwards, she reduced the price to 10,015 yen.

In the anime/game canon, Arisa demanded 300,000 yen before lowering it to 540 yen.

https://t.co/cwd65OOKe9

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