Lori beth and chachi aka scott baio played in Blansky's Beauties with carmine and rose the red headed lady who played in Rhoda

http://thiswastv.com/2012/08/28/1970s-fun-flops-blanskys-beauties/

But back to Nancy Walker. The speed with which Blansky’s Beauties was put together—as a stop-gap substitute for her other show—may have been reflected in the way it was cast: there was a lot of “spare-parts” casting, consisting of leftovers from other shows. Eddie Mekka, an inexplicable favorite of Marshall’s (it was his idea to use him on Laverne and Shirley, believing that this short dancer was going to be the next Fonz), played the identical cousin of his Laverne and Shirley character, living and working with his Aunt Nancy. After a couple of episodes, Marshall’s deserved favorite Pat Morita joined, playing Arnold from Happy Days. Because, you see, Morita had left Happy Days to star in his own show, Mr. T and Tina, only that show bombed, and he couldn’t go back to Happy Days because he’d been replaced by Al Molinaro. So Arnold became part of this show instead. Oh, and Mr. T and Tina had nothing to do with Mr. T. All very confusing.

And speaking of running things into the ground—and this is the other thing about Blansky’s Beauties that’s sort of memorable—neither Marshall nor Fred Silverman would give up on the series. They felt that they had a show there—though not with Walker, who went back to Rhoda where she belonged. But they liked the two showgirls who lived with Walker, Kaye and Lynda Goodfriend. And they liked Scott Baio, the wise-ass kid, enough to transfer him to Happy Days as a slightly different wise-ass kid. So when Silverman took over NBC, one of his first acts was to commission a new version of this show. It had Kaye and Goodfriend as sexy showgirls rooming together and trying to make it in the big city, and Baio around doing something or other, and it was called Legs. When NBC picked it up as a series, they told Marshall to tone down the sex stuff and add more men (including a young Jim Belushi), and so they wound up with a family show called Who’s Watching the Kids? This version lives on only in its terrible theme song, and in the memories of those who love and respect the Hello Larry/Supertrain era of NBC.

Both the Chachi and Lori Beth characters were unnecessary editions to Happy Days. As the years went on many other characters who were like square pegs in a round hole joined. Ted McGinley-Roger Cathy Silver-Jenny Piccolo Billy Warlock-Flip

Both the Chachi and Lori Beth characters were unnecessary editions to Happy Days. As the years went on many other characters who were like square pegs in a round hole joined. Ted McGinley-Roger Cathy Silver-Jenny Piccolo Billy Warlock-Flip

I thought that Roger was meant to be a "replacement" for Richie (after Ron Howard left the show), just like Jenny was supposed to be a female Ralph, and Flip was basically Chachi's replacement (when Scott Baio took a season off to do Joanie Loves Chachi).

Yes I would agree with that theory. They all came very far away from the originals. Roger was a poor replacement. The show even with the end of Richie season 7 was nose diving big time. The additions of these characters did not help. True the show did last another 100 episodes or so but it was grasping for straws.