tell me some stuff about Dave's classpect?

Knight of Time? Dave was literally the Server player of both Rose and Jade, and spent a good deal of time aiding the two while John was going around doing his own thing and losing his computers every three god damn panels. He used his Time Travel to serve his Friends, specifically serving Terezi the money he earned through destroying LOHAC’s economy. He helped Jade with the Frog Breeding, protected her ‘til his last breath, tried to take Rose’s place in the Moon Suicide Ride, and ended up just spending time with her before the bang- Before DD had to ruin it all and made him have to chase after the moon so the two of them ended up on it.

In a way, even his curiosity to check on Rose’s journals ended up ‘serving Time’, closing a Time Loop he wasn’t even trying to close by keeping a spare copy of the journals Rose would’ve had destroyed otherwise, and thus allowing the creation of Becquerel. In a way, even as a Sprite, he ends up ‘Serving’ as the guide of another Time Player.

Of course then we have the obvious use and weaponization of Time through Time Clones during combat and time shenanigans, not to say Caledscratch’s function to switch between a broken and full sword actually fit the ‘weaponizing’ of ‘Time’ itself quite well too.