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I've basically mained tager and arakune since BBCT. Just loved how different and weird arakune was and how brutal/frightening tager could be. When I started to get more proficient at the game I picked up Ragna as a sub around the time of CS. Since I liked his super aggressive rushdown style and the dark effects of his attacks. Basically for choosing a main I would recommend just picking a character you like the look of and see if their style meshes with what you like or think you can do. Watch pros play the character, practice with the character yourself, and look into their lore to see if it motivates you to try harder to learn the character.