Hell no, not me. The thing is, Louie has exactly three strong points: his wide attack range, his shield, and the best (or second best, not sure about [spoiler]Arma's[/spoiler] yet) defense stat in the game, taking into account his armor choices. Conversely, Charme (thief) and Caillou (mage) are two of the most fragile, and they start with garbage equipment whereas you've probably upgraded Louie a bit already just to unlock them. You can't play them the same way.
Charme is a lot more dependant on player skill, but her ceiling is much higher than Louie's, and her mobility and speed alone are worth the effort of learning to use her. She has the best dash in the game by far, allowing her to sneak around monsters for easy side and back attacks, or outrun pretty much anything, and her parry can block almost any attack, melee or ranged, physical or magical, making it even better than Louie's shield if you can pull it off. Her flame dash doesn't do a lot of damage but is invincible all the way through and is a great panic button.
Caillou's slow but he's a walking armageddon, very much an "offense is the best defense" character. Sparkburst is ridiculously effective, to the point where he's easily the best character for boss rushes. The key is to not be stingy with his magic. He's got a lot of SP and recharges it with his basic attacks (both melee and charged), so you can bonk slimes, bunnies and skeletons with your cane and pretty much vaporize everything else with Sparkburst. The fire blast is situational but good when you're mobbed, and it's a sphere AOE so it can hit flying enemies. And the ice mine is good against the knights because it can hit them in the back. Later on he gets homing fireballs and a random teleport spell, both of which are spectacularly useful in some circumstances.
