Being a protector of good you are more intelligent and wise, you gain a +2 to Intelligence and a +1 to Wisdom

Because you are a celestial you have Darkvision out to 60ft, which means you can see in Dim Light as if it was Bright Light and Darkness as if it was Dim Light but you cant discern color in Darkness only shades of gray. Additionally you know the Light cantrip at first level and can cast it at will, Wisdom is your spellcasting ability for it.

Being a humanoid your size is Medium as you have about the build of a human

Usually being a creature of good Aegis Bearers tend towards Good, however not all Aegis Bearers were created to protect good, those that were created to help evil tend towards an Evil Alignment. Regardless of there intended purpose they all tend towards Chaos.

The gods have dessided that Aegis bearers should have a connection with the holly plant. At 3rd level you cast the lesser restoration spell once with out expending a spell slot, but you must provide 3 holly berries and 2 holly leaves in addition to its other components, all of which are consumed by the spell, you regain the ability to cast it again when you finish a long rest. In addition as long as you have a piece of holly plant on your person you have Resistance to Necrotic Damage and Resistance to Radiant Damage.

Your races main purpose is to protect. Because of this you can mantle holy might and project a celestial aegis onto other creatures preventing harm. At 3rd level you can use Bonus Action to mantle this power, while mantled you gain a flying speed of 30ft as wings of condensed light form around you, additionally you can use an Action on your turn to grant any number of willing creatures within 20ft of you Temporary Hit Points equal to your level, these last until used up. The mantle lasts for one minute or until you use your bonus action to end it. Once you use this ability you maut take a short or long rest before you can use it agian.

You can touch a willing creature within range, and Heal them 1d8 + half your level (rounded up). You must finish a long rest before you can use this ability again.