With Irregular Expressions custom virtual keyboard you can add expressive flair to your text messages, tweets, facebook posts, and everywhere else where text styling is not allowed. This keyboard features 30+ different font styles, such as: 𝕺𝖑𝖉 𝕰𝖓𝖌𝖑𝖎𝖘𝖍, sᴍᴀʟʟ ᴄᴀᴘs, uʍop ǝpᴉsdn, 𝓈𝒸𝓇𝒾𝓅𝓉, and many more*!
When choosing a keyboard for your Android device, pay attention to privacy and what information is being collected. Irregular Expressions is free/libre and open source software (FLOSS) application. It has not tracking code, does not collect any analytics, and respects your privacy. You can also find it on F-droid.
Source code is available here:
*) Note: some characters are not supported on older versions of Android. Android Oreo (8.0) or higher is required for full collection of styles.