I watch it for that ninja girl. Nuff said

Kenshin has always mistaken as woman. The only things that recognizing him as Battousai is his scar on his face and the sword that he is carrying with. The same goes for his sensei (if you have read Seijiro Hiko's one shot manga).

In the manga, Kenshin live happly ever after.
In the anime, the ending is hanged
In the OVA, Kenshin got AIDS and die.

I prefer the manga's ending. Any ending prefered by the original author for me is the true ending. However, I do respect Shishio as the strongest enemy Kenshin ever face. The rest is just a bunch of idiot who fight him just for revenge and personal matter, instead of plan to take over the whole Japan(but Shishio's attempt to take over hell in afterlife is consider ridiculous lol)