>>44132765I'm just going off of the games. Diantha's conversation with Lysandre at least gave her some depth.
Meanwhile, you have Lance. RGBYGSC are pretty bare bones compared to today, but his words to Silver are a huge part of what helped him change. You at least also get an idea that he has a strong sense of justice
Steven loves his rocks, so he has a hobby. He also is the first to act like a proper mentor Champion to the player, which Leon fails to do properly.
Cynthia does her research into myths
Alder plays a big part in guiding you and Cheren and helps Cheren to question why he wants to be strong instead of just for the sake of being strong
Kukui has his dream of starting the Alola League in addition to his research in Pokemon moves. He also does it in a way that incorporates Alola's traditions with the Island Challenge. He also has interactions with Guzma that show their differences in dealing with their own personal failures.
Meanwhile, what is Leon other than just being strong?