Ostinato Idol Mu

Mu is a virtuadoll idol who ended up gaining sentience along with Aria, who was created at the same time as her. She is overall cheery and upbeat, enjoying doing her best to ease peoples worries, to this end she and Aria were able to create the virtual space Mobius where Mu met her Ostinato Musicians who compose songs for her to sing. Being a program designed to sing songs given, she can easily replicate a song when she comes across it.
Her singing grants certain buffs to her allies depending on the song for as long as the performance lasts. She also has the ability to shift between her full size and chibi forms.

Using the power of her songs Mu can enhance the abilities of her allies. Her songs and their effects include;

Tokimeki*Riverie, composed by the musician Sweet-P the song grants enhanced defence to those who hear it.
Love Scope by Stork grants enhanced attack and defence against female opponents
Originality Incident composed by Shonen-Doll grants allies a boost in attack and defence when they are outside of a certain distance from other allies.
Onboro by Kuchinashi grants electric elemental damage added to the melee attacks of allies with a chance to paralyse and a boost to any electricity based attacks allies may have.
Sadistic Butterfly Queen by Mirei grants a similar effect to Love Scope but against male opponents instead
Angel's Song by Ike-P grants a boost to ranged attacks of allies
sin composed by Shadow Knife grants dark elemental damage and a boost to any dark based attacks allies may have
Cosmo Dancer by Wicked grants an explosion effect to allies' attacks and boosts the effects of any explosion based attacks
Distorted Happiness by Thorn grants an ice effect and boosts ice damage.
Suicide Prototype by Lucid grants a boost to speed and accuracy.
Orbit is Mu's ultimate song, granting enhancement to all stats and a light effect to allies' attacks
Indigo Destiny, the first of Mu's non-Ostinato songs, originating from the Muse Lumen. The song is a duet between her and Aria, granting allies drastically increased elemental abilities and resurrecting any incapacitated allies when the performance begins. The song synergises well with he power of the Azure Striker, granting that power even more enhancement.