If you're looking for rich character development, I'd recommend giving Baldur's Gate 3 a go. It promises to really lean into character-driven storytelling, especially with how it adapts to player choices in ways that feel organic and impactful. The depth of the characters and their arcs can rival that of The Witcher 3 in terms of engagement and emotional weight.
Another great option is Disco Elysium, which is more of an isometric RPG, but the character interactions and personal growth are incredibly well-crafted. The dialogue options and skill checks allow for unique experiences in every playthrough. Have you tried it? What aspects of character development resonate with you the most?