Because I was confused when I first started reading and I have no energy to make a second wikia, have a simple character guide including everyone’s names (in hanzi and pinyin with direct translations) and their basic role in the story. I’ll update it as more gets translated.

Note: Contains some spoilers!

Main Characters

Shen Qingqiu (沈清秋, Shěn Qīngqiū, "Liquid, Clear Autumn")
• Title: Xiu Ya Sword (修雅劍, Xiū Yǎ Jiàn, “Elegant Cultivating Sword”)
• Role: Qing Jing Peak Lord, Main Character (of Scum Villain)
• Alias: Peerless Cucumber (絕世黃瓜) (plant body)

Shen Yuan (沈垣, Shěn Yuán, “Liquid, Wall”)
• Title: Online handle: Peerless Cucumber (絕世黃瓜)
• Role: Main Character (transmigrates into Shen Qingqiu)

Luo Binghe (洛冰河, Luò Bīnghé, “Luo (River), Icy River/Glacier”, “Lowered into an icy river”)
• Role: Main Character of Proud Immortal Demon Way

Cang Qiong Mountain Sect

Yue Qingyuan (岳清源, Yuè Qīngyuán, "High Mountain, Clear Origin")
• Title: Xuan Su Sword (玄肅劍, Xuán Sù Jiàn, “Profound Solemn Sword”)
• Role: Cang Qiong Mountain Sect Master

Liu Qingge (柳清歌, Liǔ Qīnggē, “Willow, Clear Song”)
• Role: Bai Zhan Peak Lord, Liu Mingyan’s older brother

Mu Qingfang (木清芳, Mù Qīngfāng, “Wood, Clear Fragrance”)
• Role: Qian Cao Peak Lord

Qi Qingqi (齊清萋, Qí Qīngqī, "Even, Clear Luxuriant")
• Role: Xian Zhu Peak Lord

Shang Qinghua (尚清華, Shàng Qīnghuá, "Still/Esteem, Clear Flower")
• Role: An Ding Peak Lord, real world penname Airplane Shooting Towards The Sky

Ming Fan (明帆, Míng Fān, “Bright, Gallop”)
• Role: Qing Jing Peak Disciple, encouraged by original Shen Qingqiu to bully Luo Binghe

Ning Yingying (寧嬰嬰, Níng Yīngyīng, “Peaceful, Infant”)
• Role: Qing Jing Peak Disciple, one of Luo Binghe’s harem members in the original novel

Liu Mingyan (柳溟煙, Liǔ Míngyān, "Willow, Drizzle Mist")
• Role: Xian Zhu Peak disciple, Liu Qingge’s younger sister

Demon Realm

Sha Hualing (紗華鈴, Shā Huálíng, “Magnificent/Splendid Bell”)
• Title & Role: Demon Saint of the Demon Realm who tried to attack Cang Qiong Mountain Sect

Elder Du Bi (”Elder Single Arm")
• Role: Elder from the Demon Realm, fought Shen Qingqiu

Elder Tian Chui (天錘長老, Tiān Chuí Zhǎnglǎo, “Elder Sky Hammer”)
• Role: Elder from the Demon Realm, fought Luo Binghe

Meng Mo (梦魔, Mèng Mó, “Dream Demon”)
• Role: Elder from the Demon Realm currently without a physical body

Mo Beijun (漠北君, Mò Běijūn, “Northern Desert Lord”)
• Role: A demon lord

Huan Hua Palace

Gongyi Xiao (公儀蕭, Gōngyí Xiāo, “Public Ceremony, Mournful”)
• Role: Huan Hua Palace disciple, deceased

Qin Wanyue (秦婉約, Qín Wǎnyuē, “Graceful & Subdued”)
• Role: Huan Hua Palace disciple; Wanrong’s older sister, one of Luo Binghe’s harem members in the original novel

Qin Wanrong
• Role: Huan Hua Palace disciple; Wanyue’s younger sister, one of Luo Binghe’s harem members in the original novel; dies during the Immortal Alliance Conference