Okayy.. Let's discuss one by one. Have you downloaded the walkthrough pdf that I made? did you read it skipping? download the revised version. and read each quest carefully. don't skip!!.
1. The Less Tall Lady always appears after you free her from the bugplug in the Cafeteria and she will become a normal ghost in the Asylum.
2. SCM-835-NP (Variant Blue): you have to meet her shadow in the Reiko Hallway 2 Asylum Portal and she will appear as a normal ghost in Sakurai House.
3. Vicisious Nurse: This is a bug, the chance of appearing is very small, try downloading the new version v.0.3.2.1. She will appear normally in the Asylum after you choose option 1 during the quest.
4. Regarding the asylum light switch, go to Jack Hallway 2 > Turn on light switch 3 then light switch 2, and exit the map, see on the contract board the name Sakurai House changes to Karasuyama House.
5. This for new walkthrough: https://www.mediafire.com/folder/66f5v3rhabzcr/LAGS+Games+Guides+with+Images#66f... (Please, if you are new, read it very carefully and thoroughly. There are many twists that occur with the selection of routes 1 & 2 with different results.)