This is a paid asset, but now you can download ZE Burning alphabet Free.
Detail this asset from Unity Store: Original Link
ZE Burning alphabet v1.0
“If possible, please buy the package to support the developer”
The pack contains prefabs with letters of the English alphabet (capital and lower), roman numerals and other symbols. All effects are using 2D sprites. Mobile supported
if you have questions or suggestions, send them to my email