Genshin Impact can badges featuring the 54 characters (so far).
 
Listings by element:
Pyro characters listing
Hydro characters listing
Anemo characters listing 
Electro characters listing 
Dendro characters listing 
Cryo characters listing
Geo characters listing
Other characters listing
 
 
These are all the characters, listed by element:
Pyro
Xiangling (香菱)
Xinyan (辛炎)
Hu Tao (胡桃)
Yoimiya (宵宮)
Klee (クレー)
Amber (アンバー)
Bennett (ベネット)
Thoma (トーマ)
Lyney (リネ)
Diluc (ディルック)
Ga Ming/Gaming (ガミン)
Dehya (ディシア)
 
Hydro
Barbara  (バーバラ)
Mona (モナ)
Nilou (ニィロウ)
Childe/Tartaglia (公子/タルタリヤ)
Yelan (夜蘭/イェラン)
Furina (フリーナ)
Neuvillette (ヌヴィレット)
Sangonomiya Kokomi (珊瑚宮心海)
 
Anemo
Sucrose  (スクロース)
Sayu (早柚/さゆ)
Kaedehara Kazuha (楓原万葉)
Xiao (魈/ショウ)
Wanderer (放浪者)
Venti (ウェンティ)
 
Electro
Fischl (フィッシュル)
Beidou (北斗)
Keqing (刻晴)
Yae Miko (八重神子)
Raiden Shogun/Ei (雷電将軍/影）
Lisa (リサ)
Cyno (セノ)
 
Dendro
Nahida/Kusanali (ナヒーダ/クラクサナリデビ)
Kirara (綺良々)
Tighnari (ティナリ)
Yaoyao (ヨォーヨ)
Kaveh (カーヴェ)
Alhaitham (アルハイゼン)
 
Cryo
Diona  (ディオナ)
Eula (エウルア)
Kamisato Ayaka (神里綾華) 
Chongyun (重雲/チョウウン)
Kaeya (ガイア)
Ganyu (甘雨/カンウ）
Wriothesley (リオセスリ)
Qiqi (七七)
 
Geo
Arataki Itto (荒瀧一斗)
Zhongli (鍾離/ショウリ)
Noelle (ノエル)
Gorou (ゴロー)
 
Other/Special
Traveler (Lumine)/ 旅人  (蛍)
Traveler (Aether)/ 旅人  (空)
Paimon (パイモン)
 
 
Size: 57mm (approx 2.2 inches)
 
Original releases :
Set A (Xiangling, Xinyan, Fischl, Hu Tao, Barbara)
2021-03-28 (SHT2021春・オイラは非常食じゃないぞ！3)
Online sales start: 2021-03-29
Current batch (second print): 2021-04-25
 
Set B (Sucrose, Diona, Beidou, Mona, Yoimiya)
2021-11-07 (ぷにケット44・オイラは非常食じゃないぞ！6)
Online sales start: 2021-11-08 
 
Set C (Eula, Keqing, Klee, Yae, Lumine -Anemo-)
2022-03-20 (SHT2022春・オイラは非常食じゃないぞ！8)
Online sales start: 2022-03-21
 
Set D (Amber, Nahida, Nilou, Raiden, Sayu)
2022-10-30 (ぷにケット46・オイラは非常食じゃないぞ！11)
Online sales start: 2022-10-31
 
Set E (Ayaka, Bennett, Chongyun, Itto, Kazuha, Kirara, Lisa, Paimon, Thoma, Xiao)
2023-07-30 (COMIC CITY 東京 149・神の叡智11)
Online sales start: 2023-07-31 
 
Set F (Childe, Cyno, Lyney, Zhongli, Wanderer)
2023-09-23 (スーパーヒロインタイム2023秋・オイラは非常食じゃないぞ！15)
Online sales start: 2023-11-24
 
Set G (Yelan, Furina, Kaeya, Ganyu, Wriothesley, Noelle, Aether)
2023-12-30 (COMIC MARKET 103 DAY 1)
Online sales start: 2024-01-01
 
Set H (Diluc, Neuvillette, Kokomi, Venti, Tighnari, Yaoyao)
2024-2-11 (TOKYO FES February 2024・神ノ叡智14)
Online sales start: 2024-02-12
 
Set I (Kaveh, Alhaitham, Ga Ming, Dehya, Gorou, Qiqi)
2024-3-17 (HARU COMIC CITY 32 - 神ノ叡智15)
Online sales start: 2024-03-18
 
 
More characters to come!
 
These are fanmade items. Genshin Impact and its' characters belong to Mihoyo/Hoyoverse.