Iris is a direct (massive) upgrade to SSR Tsukuyomi, so she doesn't see much play in perfect teams. SSR Artemis will be okay on Light-tier once she gets buffed, not sure when that was. December? January? Until then, Lugh is a direct (massive) upgrade to SSR Artemis.
... hell, both Iris and Lugh are just outright insane in their own right.
There is also Tish who is super good, but Michael forms the backbone of every conceivable team soooo... ... since you're kinda missing everyone, is there any reason you want to focus on Light? I'm not saying it's wrong, it's just that you're quite a long way from having an insane Light team specifically.