I posted more about this in my introductory topic so I won't go into detail.
I would have liked to see Li more necessary from a gameplay perspective, but I grew very attached to him. I enjoy being drawn into the game so I enjoyed the little sweet moments where they hugged, and I often did that after a difficult boss. In the Sunken City, I was almost as angry as Naija and that Steam achievement didn't help matters. It's sad though to think that the true ending was so tragic, one wonders what happened to Li after Naija disappeared.
Either way, I would not like to see more dialogue, the game's strength was in its voice-overs, but the instances of actual dialogue were quite lacking due to the limited animation. Li's character would be better developed by Naija talking about him the way she did in Sunken City.