![/\/\/\ 4koma aura bow comic commentary_request crescent crescent_hair_ornament greyscale hair_bow hair_ornament hat hat_bow highres kirisame_marisa long_hair lunasa_prismriver merlin_prismriver mob_cap monochrome no_humans patchouli_knowledge shaded_face smile star_(symbol) tani_takeshi touhou translation_request witch_hat yukkuri_shiteitte_ne rating:s score:1 post #2756363](/cdn_image/preview/4c/fa/4cfacb61636c22f06909c5c21e7442f1.jpg)
The "Poltergeist Trumpeter". Middle sister of the Prismriver Sisters, joint Stage 4 bosses of Touhou's Perfect Cherry Blossom and individual playable characters of Phantasmagoria of Flower View.
She can play a trumpet without physical contact, and her music is uplifting in character. She's normally happy-go-lucky, but becomes manic-obsessive over anything that piques her interest.
Merlin is notorious for a programming bug in PCB where she acts erratically during the sisters' final spellcard attack "Ghostly Wheel Wondrous Concerto Grosso", resulting to her portrayal in doujins as rather rebellious. This bug also gave her an "alter-ego" named "Merupo" (めるぽ) - a combination of her name and "nurupo", Japanese shorthand for "null pointer exception") - where her face is replaced with a Shift_JIS smiley face "ξ・∀・)".
She seems to be designated the busty sister as noted by all the pictures.