Important so far: 

Fujimiya Amane[MC] (Angel Next Door) [Male]

Akazawa Itsuki (Angel next door) [Male]

Kadowaki Yuta (Angel next door) [Male]

Shiina Mahiru (Angel Next Door) [Female]

Kuronuma Sawako (Kimi ni Todoke: From Me to You) [Female]

Hoshino Ruby (Oshi no ko) [Female] 

Hoshino Aqua (Oshi no ko) [Male]

Busujima Saeko (highschool of the dead) [Female]

Revealed/active character:

Male: 

Irido Mizuto (My step-sister is my ex)

Kitao Kuronuma (Sawako's Father) 

Conan (Well Conan)

Female:

Hiratsuka Shizuka (Oregairu)

Irido Yume (My step-sister is my ex)

Aoyama Nanami (Sakurasou)

Youko Kuronuma (Sawako's Mother)

Takina Inoue (Lycoris Recoil) 

Nishikigi Chisato (Lycoris Recoil) 

Shihoko Fujimiya: (mom)

Mentioned but not shown yet:

Shuuto Fujimiya: (dad)

Bluelock Charactes