It will depend on its gameplay and your tastes. If you have good hands, Queen will be the best option, although she will have a bit of problems with boss 40 due to her slowdown field, and if you don't want a complicated character, Shiryon would be better since you only worry about rolling. skills and dodge and will have no problems with boss 40, in my personal opinion I prefer Shiryon more than anything for Boss 40, although Queen can also defeat boss 40 but you will have to make a large investment in Covenant and the treasures
I have two questions based on ur experience
1- Shiryon or White Queen ?
2- Which character has the most value in the game to invest in ?
It will depend on its gameplay and your tastes. If you have good hands, Queen will be the best option, although she will have a bit of problems with boss 40 due to her slowdown field, and if you don't want a complicated character, Shiryon would be better since you only worry about rolling. skills and dodge and will have no problems with boss 40, in my personal opinion I prefer Shiryon more than anything for Boss 40, although Queen can also defeat boss 40 but you will have to make a large investment in Covenant and the treasures