I think 'Mo Tian Ji' might be comparable. It features an engaging plot and diverse characters like 'Douluo Dalu'. Both have fantasy elements and focus on the journey of the main characters.
One manga that could be similar is 'Soul Land II'. It has similar elements of adventure and character growth as 'Douluo Dalu'.
I'd suggest 'Battle Through the Heavens'. It has a similar world-building and character development style as Doulou Dalu. Both focus on the growth and struggles of the main characters in a fantastical setting.
'Hunter x Hunter' is comparable. It features unique powers, strategic battles, and a focus on character growth and their relationships, much like in Naruto.
Maybe 'Honey and Clover' is comparable. It delves into the emotional lives of young characters and their struggles, much like in Oregairu. The art style and character dynamics can give you a similar vibe.
I think Tower of God is quite similar. It has an engaging plot and well-developed characters like SoloLeveling.
One manga that comes close is 'The Gamer'. It shares some similarities in terms of the protagonist's growth and the fantasy elements.
I'd recommend 'Paradise Kiss'. It shares some similarities with Nana in exploring complex relationships and the characters' growth and struggles.
I'd say Naruto. The anime adheres closely to the manga's storyline and character developments. There are a few filler episodes, but the main plot is consistently in line with the manga. The animation brings the manga's world to life very accurately.
One manhwa that's somewhat similar to Douluo Dalu is Tower of God. Both have elements of fantasy, adventure, and characters striving for power and growth.
Well, if you're looking for manhwas like Douluo Dalu, I'd recommend Solo Leveling. It features a protagonist's growth and exciting battles in a fantasy world. Another one could be Noblesse, which has a similar epic and supernatural theme.
They can be quite similar, often sharing core storylines and key character traits.