[TokuChris]

Here's some fun brief rundowns for you in terms of "original" versus "adapted" in terms of villains etc.

MMPR Season One
- Rita Repulsa (adapted)

MMPR Season Two
- Lord Zedd (original)

MMPR Season Three
- Lord Zedd, Rita Repulsa (original)
- Master Vile (adapted)
- Rito Repulsa (adapted but became original)

Zeo
- King Mondo (adapted)
- Prince Gasket is the older brother of Prince Sprocket. But in OhRanger, Prince Gasket is actually the transformed, older form of Prince Sprocket. Any scenes where they are together in Zeo is original.

Turbo
- Divatox (original), her henchmen are all adapted

In Space
- Astronema (original)
- Ecliptor (adapted)
- Dark Spectre (original, was "Mulgore" in Turbo: A Power Rangers Movie)
- Psycho Rangers (adapted)

Lost Galaxy
- Big insect guy (original)
- Trakeena (original)

Lightspeed Rescue
- Diabalico (adapted)
- Queen Bansheera (adapted)
- Impus (adapted)

Time Force
- Ransik (original)
- Nadira (original)

Wild Force
- Master Org (human form original)

Ninja Storm
- Lothar (original)

Dino Thunder
- Mesagog (original)

SPD
- Grumm (original, the actor is now Mentor Ji in Power Rangers Samurai)
- The Magnificence (original, possibly some adaption, not sure)
- A-Squad (100% original and awesome)

Mystic Force
- The Master (adapted)

Operation Overdrive
- The ice guy and the girl ninja are original, rest adapted

Jungle Fury
- DaiShi (adapted)

RPM
- Venjix (original, but his "bodies" were adapted)

Samurai
- Master Xandred (adapted)
- Daiyu (adapted)
- The fan guy (adapted)
- Octoroo (adapted)
- Deker (adapted, even in human form wears same clothes as Sentai counterpart)

Someone help me if I am wrong on some stuff. I know if we get in to the "fodder foot soldiers" it's a little trickier.

MMPR - Puddies (adapted)
MMPR S2 - Z Puddies (original)
MMPR S3 - Tengas (original)
Zeo - Cogs (adapted)
Turbo - Pihrana-somethings (original)
In Space - Pihrana-trons (original)
Lost Galaxy - Stingwingers (....adapted? Dunno)
Lightspeed Rescue - Batlings (adapted)
Time Force - Forget the name (adapted)
Wild Force - No idea, never watched
Ninja Storm - I forget what they're called, but ADAPTED!
Dino Thunder - The Tyranno-drones were original, but the Triptoids that came later were adapted
SPD - Adapted
Mystic Force - Adapted
Operation Overdrive - Adapted
Jungle Fury - Adapted
RPM - Adapted
Samurai - Adapted