Item Slots for a homebrew player race?

[MonkeySage]

They physically resemble ordinary penguins- so aquatic avians.

[sreservoir]

IMO it takes a high standard of geometric impossibility to be worth abandoning the standard humanoid body slots on a player race, even if you have to fudge the fluff a little—maybe they'll have to wear rings and gloves on their feet and boots on their wings. We're talking about magic items that can resize to fit the wearer, after all.

[Silly Name]

- Neck slot: they have it
- Chest slot: no doubt
- Head slot: same, may be a bit difficult for items that don't fit themselves to the wearer
- Belt slot: uhhh, kinda? Not really the same as humanoids, but I can picture a penguin wearing a belt
- Feet slot: Don't really see it fitting, unless they get the item custom-made

Your main issue here is rings, gauntlets and bracelets. You have to decide whether they have actual penguin-like wings, or humanoid arms. As said above, you may obviate rings by having them worn on the feet, but everything else looks weird.

But it's not just that: if they don't have humanoid arms, then they also can't really manipulate most objects. They can't hold swords or use a lockpick, and they'd seriously struggle to grasp and grab anything. For the sake of player's comfort, I'd make those creatures a bit more anthropomorphic while retaining the general penguin shape and look.