There is one more Rin missing from this picture and she's from the Fate series.
iggikoopa said:
also kokonoe_rin is missing
These twopictures should answer the questions. The first picture is about characters whose name end with 凛 but Shimotsuki Rin (霜月 凛) is missing. The second picture is about characters whose name end with りん and its various forms such as リン.