Thanks for bearing with me through the downtime and/or late updates. The core issue behind both has (hopefully) been resolved, so things should be stable now.
Card Rarity X X X X
  SSR SR R N
High stat X X X X
  Vocal Visual Dance Balanced
Idol Attribute X X X
  Cute Cool Passion
Skill Type X X X X X X X X X X X X X X
  Perf. Lock* C. Guard Combo Bonus Score Bonus Healer H. Guard Overload All-Round Concen. Skill Boost Focus/Coord. L. Sparkle Encore T. Synergy
Awakened?   X
  Yes No

(Short link)

Click on an underlined table header to sort the table by that value. Do note that you should apply filters before using the skill-based sorts, as you can't really compare skill effects.
Card VoViDa Skill Effect (sort: time window, % chance, duration, effect val.)
Takafuji Kako
福を呼ぶ舞姫
4318 4318 4318
慶賀の演舞 Every 12 seconds: there is a 40..60% chance to activate the previous skill again for 4..6 seconds.
Mimura Kanako
新春の彩り
5920 3879 3211
ハッピーシェアリング ! Every 9 seconds: there is a 40..60% chance that you will gain an extra combo bonus based on your current health for 4..6 seconds.
Ichihara Nina
にゅーいやー
2564 4972 3144
にゅーチャレンジ Every 8 seconds: there is a 40..60% chance that you will gain an extra 10% combo bonus, and Perfect notes will restore 1 health for 3..4.5 seconds.
Otokura Yuuki
華傘の芸達者
4888 3186 2631
和の純心 Every 11 seconds: there is a 40..60% chance that Perfect notes will receive a 15% score bonus for 5..7.5 seconds.