Lum’s neutral A is very good anti-air. Maybe too good. But it’s not a reversal, meaning it does have a few startup frames where he can be hit. If you need a reversal, he can super. That is a poor man’s reversal in that it’s invulnerable (good!) until the point that it can hit. On the same frame it can hit, it can also be hit, so it will trade with a solid jump in, but that at least gets them off you. You can also attempt ground B as an anti-air depending on timing and spacing.