As already stated here, every series provides four User Titles per 5★ character of that series if the series has its Crea Craft implemented. GA Geijutsuka Art Design Class got its Crea Craft added on 14 May 2021, thus all four titles are available ever since.
The following list contains all titles obtainable via 5★ characters from GA Geijutsuka Art Design Class. The first tab displays the two titles gained simply by leveling that character, and the second tab displays the two titles that are related to Creamate Comm.
This was also already stated at the page for User Titles, but in addition to the character-related titles, every series has another three titles, which are related to the Crea Craft of that series. The following list contains all three titles for GA Geijutsuka Art Design Class: