There are 43 characters in the our alphabet, and not all of them are regular English characters. For typing special characters you will need software keyboard. Click here to see more...
This is different from a font. A keyboard sends characters to the computer and the computer uses fonts to display those characters. If you use a font for Twulshootseed the keyboard is still sending the original key to the computer. So if you switch fonts or send your text to someone who does not have the font installed, it will display the English character. However, with a software keyboard, when a key is pressed it sends the code for the lushootseed character to the computer and the computer uses a system font to display the letter. This is better because most platforms have at least 1 font that can display all Twulshootseed characters. The only catch to this is that some special fonts or even common fonts can have issues displaying certain characters. Below are the links to the Windows and Apple keyboards from languagegeek.com.