Hey, we're the Galilean 4!! I hope you don't mind us sharing the same account..!
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• Names
Ganymede: Leo Mayr Zeno
Callisto: Callisto
Io: Io ("Callisto and I don't have official names yet, alright?!" -Io)
Europa: Gretel Mayr Zeno

• Gender
Ganymede: Male
The other three: Female

• Height
"I'm a bit taller than Mr. Mercury!!" -Ganymede

"Well.. I'm just a bit shorter than Ganymede." -Callisto

"Do you have to know??" -Io

"I-I-I uh.. I'm the s-shortest!!" -Europa

• Other
  Ganymede: I have a strong magnetic field..! 

  Callisto: I'm old-fashioned. From what I heard.

   Io: Whatever I have is none of your business!!! (Ganymede: Io, calm down!!)

   Europa: I-I uh.. *stares at her bed room door and looks back at you* I-I shiver a l-lot..

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 "I'm the one with the brown hair and green eyes.. T-the one with the ponytail as well!!" -Ganymede

 "I'm the one with the braids and glasses." -Callisto

 "What do you expect me to look like? I'm the one with the bad temper and blonde hair." -Io

 "I-I-I'm the one w-with the yellow eyes.. A-and I'm the shortest among u-us four!!" -Europa

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   × Jupiter: @ll_JupiterZeno_ll