What is the 30M pre-registration reward?

Sunlit Myriad is a skin set, so what you get is appearance and nothing else. No stats, no starting items, no head start on catching anything. If you are deciding whether to pre-register for it, decide on whether you want the look.

The other thing to understand is that you do not earn this one. The count is shared across everybody who signs up, so a milestone either lands or it does not, and nothing you do in game moves it. Your part is registering, then claiming.

The tiers under 30 million

The ladder pays out along the way. At 15 million you get two AniPod Ultras. At 20 million the reward is the Companion Promise limited avatar frame, another cosmetic. By the time the count reaches the Sunlit Myriad set, the pattern is one batch of usable items low down and decoration above it.

Pre-orders are a separate track

Pre-registration rewards and pre-order rewards are not the same pool. Aniimo takes pre-orders on consoles, Xbox included, and the PlayStation pre-order carries its own exclusive accessory, Fluffy Friend. Pre-order bundles and extended editions add starting items and bonuses on top of that. Buying an edition does not get you Sunlit Myriad, and pre-registering does not get you Fluffy Friend.

Not settled: What the Sunlit Myriad set actually dresses, your character or an Aniimo, has not been shown yet.