There are several manga that could have a main character similar to Dokgo. One possibility is 'One Punch Man' where the MC has unique powers and a distinct personality.
Well, 'My Hero Academia' might fit the bill. The MC in it shows determination and growth, similar to Dokgo in some ways. It also has an engaging storyline and diverse characters.
You could check out 'Naruto'. The MC has a strong will and goes through various challenges and developments, which might remind you of Dokgo. Plus, the world-building and action scenes are quite exciting.
I think 'The Breaker' could be similar. It has a similar style of action and character development.
You could check out 'Claymore'. The lead character has a similar fierce and independent spirit like Guts, facing various hardships in a dark world.
I think 'The Gamer' could be similar. It has elements of action and adventure like Dokgo.
I'd suggest looking at 'Sword Art Online'. The protagonist shows a mix of confidence and strength similar to Izayoi. Plus, the story has exciting action scenes that could appeal to you.
I think 'Death Note' has a really surprising MC. Light Yagami's transformation and his complex strategies keep you on the edge of your seat.
The Dokgo manga on Manga Rock is available for reading, but its presentation might vary depending on the platform's layout and interface.
You could try 'Tower of God'. It shares elements of adventure and mystery similar to Dokgo. The characters' development and the world-building are quite engaging.
There's also Naruto Uzumaki from 'Naruto'. The Nine-Tails' chakra within him causes various problems and could be seen as a mysterious 'illness' of sorts that he has to deal with and overcome.
The mc ride manga and anime are related, but the anime can make changes to enhance the viewing experience. Sometimes characters' expressions or actions might be emphasized differently.