ranki is a very trust-worthy and loyal friend. They are funny and they are a great friend to have. Don't cross them though cause she's a bit of a baddie. They probably love anime and they probably also like hello kitty just saying. So if they ever ask you to go ghost hunting with them you better say yes.
A rancid reminder is the act of taking a shit earlier in the day and not flushing it and leaving it there. Once you return to the toilet later on and take a piss on the old shit the smell that is let off is known as a rancid reminder.