There are a lot of Knights I'd like to see get a second form (Astra Galus, Dahlia and Monotropastrum spring to mind) but for the most part it comes down to popular votes to determine which Knights get new versions. As shown, that tends to result in a lot of familiar faces in the top spots:
- Anemone has been a top vote-getter pretty much since her introduction back in 2015, being in the top two for most polls and #6 in the one poll she didn't get gold or silver in.
- Pinkladies has been in the top three for every single poll I checked so she really is shaping up to be Anemone v2.0.
- Cattleya has been in the top ten of almost every poll with her worst showing being #11 in the Pure Flower Princess poll that Anemone won (and Pinkladies ranked third in)
- Silk Tree has only been around since late last year and she's already gotten the #1 spot in a poll, at the expense of Anemone and Pinkladies no less. She should be in good shape in the future unless her popularity fades just enough to drop out of the top 3 spots like...
- ...Lycoris/Red Spider Lily, who went from #1 in the first poll she was a part of, which landed her the 6* Shrine Maiden spot, to the #4 to #6 spots in each poll afterwards.
- Cycla Menn started out slow compared to the other Knights listed here and landed in the bottom third of the top 30 Knights for the first two polls she was a part of. She jumped to #3 in the following poll to join Cattleya and (who else) Anemone as radiant idols. Since then Miss Menn has been a lock for the top 20 in any poll she's eligible for and ended up #2 in one of last year's polls that was restricted to 2*, 3* and 4* Knights.
There are other Knights I'm forgetting but, again, the same small group of Knights are going to show up in the top sections of the polls.