If any game company is synonymous with any one particular type of game, it is Takara and beat-‘em-ups. The two go together like Princess Di and divorce papers, and while the Japan-based coders have released many disappointing examples in their time — World Heroes and Art of Fighting, to name but two — Samurai Spirits
If you download any ROM, without purchasing or freely distributed by the publisher, whether you own the physical game or not, is illegal. However if you have a physical cartridge, and you dump it into ROM and then play it somewhere else with other device with emulator, that is illegal. This is made possible through