•Battle of Olympus (NES) is very good plateform RPG
•Faxanadu (NES), another very good plateform RPG
•Simon's quest (NES), as we are in plateform RPG, let's add this one
•Shadow gate (NES/N64), but it's more a point and click adventure than a classic RPG.
I don't know how far is your rate for "less known" RPG, but here are some good one, maybe you already played them as some of them are from known series.
Snes:
•The lord of the ring - book 1 (more adventure than RPG, but very good animations and music)
•Ranma 1/2
•Lufia 1 & 2
•SOS (I can only find a boat picture on the net, but I'm sure it's a classic RPG)
•Dark law
•Treasure hunter G
•shadowrun
•7th saga
•Bahamut Lagoon
•Paladin's quest (Lennus 1 & 2)
•Dual orb
•Elfaria 1 & 2 (I never played it, I don't know if it's good
)
•Emerald Dragon
•Feda - Emblem of justice
•Lodoss to senki (I don't remember if there's an english patch)
•Traverse Starlight & Prairie
PS1:
•Grandia
•Jade cocoon
•Hoshigami
•Koudelka (prequel to shadow hearts?)
•Legend of legaia
•Marle's kingdom series (Rhapsody, Little princess)
•Rurouni Kenshin Meiji Kenyaku Romantan (humm, I think it's japanese only. I played the beginning only but it was nice.)
•Thousand arms
•Vagrant Story
•Card Captor Sakura (really easy, japanese only, good for learning japanese, no kanji at all)
•Arc the Lad series
•brave fencer musashi den (more Advantage than RPG)
•Parasite Eve 1
•Shadow madness ... (wait, it's a real crappy one, don't play this one)
•Moon: Remix RPG Adventure (japanese only, anti-hero RPG)
PS2 :
•hack// series
•La pucelle (tactical RPG)
Saturn:
•Dragon force
•shining the holy ark
mixed :
•Breath of fire (Snes, PS1, PS2)
•Landstalker (Genesis), Adventure.
•Wild arms series (PS1, PS2), RPG
•SaGa series (NES, Snes, PS1, PS2, DS)
•Ogre battle (Snes), real time strategy RPG
•Tactic Ogre (Snes, PS1, DS?), Tactical RPG
•Front missions series (Snes, PS1, DS), mixed action/RPG/tactical
•Lunar
•Atelier series
•Suikoden / Suikogaiden series
•Albert Odyssey (Snes/Saturn)
•Ys series (MSX to many new consoles)
•Hanjuku Hero (Egg Monster hero) (Snes, DS) (I thought there were a translation available)
•Tengai Makyou (Far east of eden) series (though, no English translation), parodies of other well known RPGs
•Phantasy Star series (Master system, genesis ?, other)
•Disgaea (Tactical)
•Sky of Arcadia
•Langrisser series (Snes, forgot if it's saturn too)
•Fire emblem series (Snes, gba, DS, and many other)
•Herakles no Eikou (Snes, DS) (Glory of heracles, on DS)
•Shining force (Master, Genesis .. I think), Tactical RPG (I played only the first one, I liked it)
And finally, almost all translation project from Gideon Zhi are unknown, obscure, but highly waited RPG:
•
http://agtp.romhack.net/
You can also check the DS RPG list (it's somewhere on this forum).
I tried not to give the games already suggested previously.
Maybe there's duplicate, sorry
And I'm sure there are many more I forgot.
Some of them I never played (yet), so I hope they are good choice for you