Alum

In Chapter 7 while controlling Ebot 3 as Dashu, repeatedly interact with the office chair in Mr. Glym's office.

After Alum returns to Cosmos City, use the Rushlight from your inventory on Pige, the desk clerk at the parcel company. Note: This must be done before going on the rooftop.

In Chapter 4, find the room with the Rogations. There is a sick woman inside. Use the water from the tree where the hermit lives to cure her. After the woman and her husband leave, interact with the candle on the table with your Rushlight.