Halo: Arbiter/Thel, Shipmaster Rtas, Usze (blame the fanfics), N'tho (also blame the fanfics), Jul, Ripa, Cortana, Buck, and this isn't really a character but I also like whenever an AI acts sarcastic.
TouHou Project: All of the Scarlet Devil Mansion (Remilia, Flandre, Sakuya, Meiling, Patchouli, and Koakuma), CHEEEEEEEEN, Nitori, All of Team 9 (Cirno, Rumia, Wriggle, Mystia, and Daiyousei), Eiki Shiki, Tewi, Reisen, Suika, and too many others to name or remember.
Star Wars: R2-D2, C-3PO, Chewbacca, Ashoka, Chirrut, and K-2SO.
Marvel: The Guardians of the Galaxy, Deadpool, Black Panther, and Spiderman.
Corpse Party: Sachiko, Yuki, Tokiko, Ryou, Yuka, Seiko, Mayu, and Naho.
RPG Horror: Fluffy, Ib, Mary, Gary, Aya, Cat, Saveboy/Milton, Viola, Ellen, Misao, and maybe more later.
Mogeko/Deep Sea Prisoner: Moge-ko, Idate, Old, Samekichi, Wadanohara, Nagi, and Satanick.
Walking Dead (TellTale): Clementine, Lee, Duck (most people hate him, though), Sarah (same as Duck), Mariana, Alvin Jr/AJ, MAYBE MORE, BUT I HAVE TO GO!
HAVE TO GO FINISH LATER!
PLEASE LET THIS POST!