This new Genshin Impact Lisa skin can be acquired for free if players take part in the Genshin Impact event because she's a five-star character. This is reminiscent of how Fischl and Diluc's skins were released back in version 2.8.
The Lisa's 'A Sobriquet Under Shade' skin is a throwback to her time spent in Sumeru as a scholar. It's an outfit that she had made when returning to visit Sumeru after her days of study, and it resembles her old Akademiya uniform.
Second Blooming is a team combat event with five separate challenges that contain different waves of enemies. You'll be able to choose from your own roster, as well as a few trial characters – including Lisa in her new outfit.
Each team you use for separate waves must consist of unique characters to avoid repeats, but the event uses a 'linkage' system that allows you to choose certain characters to appear more than once, on different teams.
In the end, players who participate in the Second Blooming event will be rewarded with Lisa's new skin along with Primogems, mora, level-up books, weapon ascension materials, and weapon enhancement ore.
If you want Ayaka's 'Springbloom Missive' skin, you'll need to purchase it in the shop with Genesis Crystals by spending real money. Her outfit is based on Fontaine dresses seen in light novel illustrations that depict high-class women from that nation.
Xiao, and Yaoyao banners coming in the first half of version 3.4.