Bullet Goddess and Bullet Angel look awesome, but
*Gun Goddess I hope this continues as a theme. Lucian would be a good candidate considering his moveset. Actually a better candidate than Miss Fortune was imo, considering he actually has movement abilities to incorporate thrusters with.
Oh, but Bullet Gun Goddess seems like a massive step down from the quality of Elementalist Lux. The gun shape changes, but the rest us just recolored. To have only 4 colors when that's the case seems... boring.
and
seem like good fits too, though Program and Aether Wing might be too similar in style/theme.