Mirai Shinwa Jarvas

A relatively early action-RPG for the Famicom, and it's built on a surprisingly unique concept - as the titular Jarvas, you're actually the lone survivor of a nuclear holocaust and go back in time to well before the atomic era to conquer the entire world, averting humanity's extinction in the most heavy-handed way possible.  The game is relatively full-featured for the time period, with the player able to change between multiple job classes, a pretty lengthy campaign, a rather large world map with numerous sub-maps, and a lot of sub-quests to complete to earn gold, which you must do as random enemies on the map do not drop money when defeated.  You also have a Fame stat that increases as you win duels, which you must do in order to recruit troops to open castles so you can overthrow each continent's rulers (and no, they don't provide you any aid in battle whatsoever).  That said, design-wise it's a bit of a trainwreck - it's buggy, slow paced, has very poor hit detection, it's easy to wedge the game into an unwinnable state by picking a quest you can't finish yet (you can only take one at a time and can't cancel quests without actually completing them), and it's extremely slow and grindy.  Oh, and forget trying to play as a magic user; as in old Dungeons and Dragons you start with one spell that barely does any damage, and your physical stats are so pathetic that one or two hits from basically anything will knock you dead.  It is at least notable for being the first Famicom RPG to use a battery backup to save games; prior to this games either relied on a tape recorder peripheral, rewritable floppy disks or just using a password system, and its general "western-ness" with a focus on sidequests, army battles (such as they are) and being able to change character classes are all relatively novel for the time and the platform.  Unfortunately being one of the first often means it's also one of the worst, and this is definitely no exception.

Developer: Taito
Publisher: Taito
Released: 1987
Platforms: Famicom

Cadash

RPGs are a sight rarely seen in arcades; after all, they're almost always designed to be long and involved experiences, and an arcade's main motivation is profit - getting you to play very difficult games that subtly nudge you to put more quarters into the machine every few minutes.  Cadash offers side-scrolling gameplay somewhat similar to Taito's own Rastan series, though with some RPG elements worked into the mix - there are four classes to pick from, defeating enemies earns you experience points, and you can find and purchase items and equipment upgrades throughout the adventure.  Surprisingly, it's also an early example of a co-op experience - up to four cabinets could be wired together to allow four-player simultaneous gameplay, though all four players were restricted to a single screen and their movement governed by the position of the first player to create the game.  It's not the best-balanced game ever, either - the Priest is almost comically overpowered owing to having healing magic and quite powerful (and long-ranged) weapons, while the Mage takes a good while to become anything other than useless (and even then, his limited MP often reduces you to bonking enemies with a short-ranged staff).  As you'd expect from an arcade game, it is quite difficult, with a lot of enemies and traps that are tricky to avoid and deal hefty damage on a hit, and you're constantly racing against the clock on top of everything (though you can purchase more time in in-game shops, or when you die and continue).  While ultimately nothing amazing by modern standards and not especially popular even in its time, Cadash is an interesting experiment and an early predecessor to more successful co-op experiences like Diablo and Torchlight, and that makes it worth a visit for RPG buffs.

Developer: Taito
Publisher: Taito
Released: 1989, 1991, 1992
Platform: Arcade, Sega Genesis, Turbografx-16

The Sega Genesis version is a somewhat more balanced experience from the arcade, giving you multiple lives per credit and generally less cheap enemies, though it lacks two of the playable characters (Priest and Ninja).  The Turbografx-16 port is more arcade accurate, with all four playable characters selectable, though it is also quite difficult as you get no continues without using a cheat code.  The arcade version also appears on Taito Legends 2 for Xbox and PC (though not the PS2 version).