[PC-Klik n Play][2000 - could be earlier]Action-RPG style with three playable characters, a knight, a circus-girl, and a magician.

As stated this was an action-rpg style game with three different scenarios based on the character you picked. There was a young knight or swordsman - he had the best attack, a young circus girl who might have been like a human hybrid or something - she had the best speed, and a magician in a white suit with top hat - he had the best magic ability.

The game was a top-down schmup kind of a similar feel to Binding of Isaac. I know it was klik'n'play because I remember tinkering with the code when I was younger. The only other helpful hint, was that the last scenario (the magician) was the true final ending of the game. The final boss is the Circus King or something along those lines who also happens to be the Magician's father. Once defeated there is a cut scene that implies the magician didn't make it out in time, but a final the end screen shows the magician - without his hat standing overlooking everything.