S-rank SUV which summons a meteor storm instead of rain.
Or a very very big blast like a atombomb kinda like Final Fantasy VIII Ultima spell..and it should be a room clearer off course.
Or a very powerful tornado that takes enemies up in the air and smash them hard in the ground.
Or the SUV gives you about 10 seconds of free shooting with a summon Gatlin gun which is uberpowerful offcourse.
But i guess that will lag to death for the PS2 players :S
Link to about what i would like to see as new SUV.
[PSO2] Darkante: Cast HU-44/RA-43/FI-42/GU-30
Astral Storm: Newman F HU-35
RB3 - Dark Knight "Ante" : Cast M Lv 177/ JLv Hu50/Ra50/Fo1/Va46
RB3 - Crimson Sky: Beast F Lv 124/ JLv Hu32/Ra18/Fo1/Va50
RB0 - Zone Dynamite: Beast M Lv 76/ JLv Hu0/Ra7/Fo0/Va0