Casual picks (in the context of aimed at younger people like from a few pages back) arent always new/recent characters, but long lasting characters that are in popular games time after time. For example, Id say Daisy is a casual pick, considering Marios popularity with everyone, hardcore and casual, and Daisy is in pretty much every Mario spinoff since 2000. Therefore, many casual gamers can recognize and appreciate her inclusion.
The list of new 'casual picks' can look like this-
Inkling
Daisy
Isabelle
Dixie Kong
Bandanna Dee
Gen 7 Pokemon
Shadow
Id consider that a sizable ammount of picks that casual gamers can enjoy, even if a majority of newcomers are like Ridley, K. Rool, Banjo, Simon, Geno, Isaac, etc. Afterwards, DLC can add even more of these picks, like Spring Man and other Switch characters to further balance this "30 year old boomer vs 20 year old zoomer" war going on.