HUDs, GUIs...
To see how to use HUDs and GUIs API (Font Images) you can check my examples.

GUIs

GitHub - LoneDev6/API-ItemsAdder-Example-GUI: Example usage of ItemsAdder API to crete custom textured inventories in Spigot
GitHub

Huds

GitHub - LoneDev6/RPGhuds: Customized HUDs for ItemsAdder
GitHub
GitHub - LoneDev6/API-ItemsAdder-Example-ServerMonitor: Example usage of ItemsAdder API to create custom HUDs in Spigot
GitHub

Access mana bar value example

PlayerHudsHolderWrapper huds = new PlayerHudsHolderWrapper(player);
PlayerQuantityHudWrapper manaHud =
new PlayerQuantityHudWrapper(huds, "magiccraft:mana_bar");
if(manaHud.exists())
manaHud.setFloatValue(2.0f);
else
System.out.println("Error: mana not found, maybe it's disabled.");

FAQ

Get Emoji or GUI character

new FontImageWrapper("twitteremojis:confirm").getString()
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GUIs
Huds
Access mana bar value example
FAQ
Get Emoji or GUI character