character :

princess Twilight Sparkle + Flash Sentry = Skynaria light
princess Celestia + Thorax = Alestrox ( he's a boy)
princess Luna + King Sombra = Lullalyn Moon
princess Cadance + Shining Armor = Flurry Heart
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For Video Shooting :
OBS studio

For Drawing :
MS Paint
Edit color and effect :
Ibispaint x
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Program for video editing :
Capcut

Music :
   • Video