It's hard to say for sure. There are different opinions on whether it's finished. Some think it is, while others believe there might be more to come. You'd better check the latest updates from reliable sources.
I'm not sure. It depends on the specific manga you're referring to. There could be various plot developments and character relationships that determine who it is.
Sure. The manga of To Your Eternity is good because it offers a fresh perspective, has compelling storytelling, and the art style adds to the overall charm. It's a must-read for manga enthusiasts.
Well, one way could be to involve him in the manga world. Maybe start by sharing some of your favorite manga moments with him and see if he gets interested. Another approach could be finding manga that relates to his interests and introducing it to him gradually.