Let's speculate on the endings. what kind do u want and hate?
For me i would like an ending where Karasuma and Tenma married. they went to America together. while Harima still become a manga artist in Japan. later on he meets again with either Yakumo or Eri. and their love start to blossom. Hanai and Haruki becomes the master of a dojo and have lot's of kids.
For Tani sensei i would like he to become a couple with Sasakura sensei.