“天使”和“魔鬼”是机器人爱理诗的一对伪人工智能助理程序。天使负责提供保守意见，魔鬼则负责提供激进意见。两个程序不但可以同时接收爱理诗的提问，还能看到对方的输出，甚至打断对方的输出——他们手里的武器就是打断机制的体现，而能否成功打断则是通过他们之间的简易格斗游戏决定。

本文中的这一版设计不一定是定稿，因为我觉得他们在格斗游戏以外最好能以二头身的 Q 版形象在爱理诗的脑内剧场中登场。

设计经过

天使和魔鬼这两个形象最初是 2019 年时一个自称香港潮玩公司的联系人找我要的设计方案——“画一对天使和恶魔看看吧”。草图发过去后没了下文。感觉要么是对方不满意 (2019 年时的确是我画得最生硬的时期)，要么压根就是遇到了骗子。在我最不自信的时期，这件事又给了我一次打击。

2022 年 5 月，我本着有始有终的想法将原来的草图画完，也算是给自己一个交代，把这件事做个了结。画到一半，我产生了将两人作为爱理诗的助理程序在电子之心中登场的想法。然而，我的画技要到 2022 年底、2023 年初左右才开始逐渐走出低潮期，5 月的这张图画得依然相当生硬。最致命的问题是人脸画得不够好看，尤其是天使的脸让我觉得很不喜欢，于是发出来之后不久觉得丢人，就又把它删掉了。

2025 年整理旧作品的时候，觉得因为一张不好看的脸就雪藏完成度比较高的作品有点可惜 (尤其是清理得如此干净的画面对我来说是非常少见的)，于是花了一点时间将天使的脸蛋和其他一些细节进行了修改。和同期其他旧作品重画相比，这张图的改动非常小，但有时候很小的改动就能让角色从“无感”变得“可爱”起来。

这张图的反复修改过程反映了我在创作困难时期的挣扎，这个心路历程对我来说其实远比作品最终呈现的效果来得更为重要。

“Angel” and “Devil” are pseudo-AI assistant programs for Alice Rosetta, the robot girl. Angel provides conservative answers, while Devil offers radical ones. Both programs receive Alice’s questions simultaneously, can read each other’s outputs, and may interrupt one another—this is determined by a simple fighting game between them.

The version of Angel & Devil in this article is not necessarily the “final” version; I believe they would be better represented in chibi form within Alice’s inner theater outside of the fighting game context.

Design process

The first draft of Angel and the Demon was requested in 2019 by someone claiming to be from a Hong Kong pop toy company: “Draw a pair of an angel and a devil and see how it goes.” After sending the sketches, I never received a reply. I suspected either dissatisfaction (as my drawings were quite stiff at that time) or that I had encountered a fraud. This incident hit me hard during my least confident period.

In May 2022, determined to see things through, I finished the original rough sketch to bring closure. Midway through, I envisioned the two characters as Alice’s assistant programs in Electric Hearts. However, my drawing skills didn’t improve until late 2022 into early 2023. The picture from May 2022 remained stiff; notably, the faces—especially the angel’s—were unappealing, which embarrassed me enough to delete it shortly after posting.

While sorting through old works in 2025, I regretted shelving this piece over an unappealing face (particularly since such clean image are rare for me). So, I spent some time modifying the angel’s face and other minor details. Compared to other redraws from 2025, this image underwent the least changes; yet small adjustments can elevate a character from “nothing” to “something.” Which I think is exactly the case for Angel.

This revision process reflects my struggles during a challenging period as an artist. This mental journey is far more significant to me than the final result of the work.