What are your favori- yeah, this thread again. Showa version.
 

Right, same as the Heisei and Neo Heisei version. This time the selection pool stretches from the original series through J (if Toei counts them as Showa, I'll count them as Showa - also nobody wants a "What's Your Favorite Rider - Obscure 90s Movies" thread).

Series:
Main Rider:
Riderman or Tackle:
Rider Girl:
Supporting Character:
Bike:
Rider Design:
Alternate Rider Form:
Villain Group:
Villain Mook:
Villain Design:
Opening Song:
Series' Score:


My choices

Series: Black
Main Rider: Kazami Shiro
Riderman or Tackle: Tackle
Rider Girl: Mari (original series)
Supporting Character: Tachibana Tobei, duh
Bike: Battle Hopper
Rider Design: Black
Alternate Rider Form: Biorider
Villain Group: GOD
Villain Mook: Destron
Villain Design: Shadow Moon
Opening Song: Black
Series' Score: Black

Series:
Main Rider: Amazon
Riderman or Tackle:
Rider Girl:
Supporting Character:
Bike: Amazon Jungler
Rider Design: Amazon
Alternate Rider Form:
Villain Group: Delza Army
Villain Mook: Shocker troopers with Skeleton design on the chest
Villain Design: Scissors Jaguar / Starfish Hitler
Opening Song: Black RX
Series' Score:

I need to watch more to give better answers.

Okay! I'll do my best with the limited amount of Showa knowledge I have!

Series: Amazon!
Main Rider: AMAZON!
Riderman or Tackle: Tackle
Rider Girl: Ri...Der...Girl? Tackle?
Supporting Character: Mogura Beastman
Bike: V-Machine (Super-1)
Rider Design: Strictly on design, ZO
Alternate Rider Form: Um...Biorider, I guess.
Villain Group: I dunno...
Villain Mook: *Shrugs*
Villain Design: Shadow Moon
Opening Song: I'm fond of Black's.
Series' Score: ZO.

Series: Black.
Main Rider: Black.
Riderman or Tackle: Black.
Rider Girl: Black.
Supporting Character: Black.
Bike: Black.
Rider Design: Black.
Alternate Rider Form: Black.
Villain Group: Black.
Villain Mook: Black.
Villain Design: Black.
Opening Song: Black.
Series' Score: Black.

All I've seen of Showa is Black. :(

The plucky female sidekick/sidekicks. Modern examples include Rinko, Yuuki, Hina, and Akiko.

My answers are all on Black and Shadow Moon.

Well, I do like Stronger as well as a rider, but Kotaro is far more badass.

Series: Black (Yes, I'm watching it and loving it)
Main Rider: Stronger
Riderman or Tackle: Tackle
Rider Girl: (If you mean the singing ones) Stronger
Supporting Character:
Bike: V3's
Rider Design: Amazon
Alternate Rider Form: Stronger's Upgrade
Villain Group: Shocker
Villain Mook: Shocker Troop
Villain Design:
Opening Song: Kamen Rider (The Original!)
Series' Score: Black