Can fey be evil?

Many seelie fey are good, and many unseelie are evil... There's plenty of evidence that can be found in the 4e books Manual of the Planes and HotF and the 5e DMG to suggest that the Feywild is certainly not full of only good creatures.

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In respect to this, are fey undead?

The fey might not be undead at first, but its body might slowly rot from the inside until every ounce of LIFE is wrung out and it becomes what we'd consider an undead creature. Then, can fey be charmed 5e? Fey Charm. The dryad targets one humanoid or beast that she can see within 30 feet of her. If the target can see the dryad, it must succeed on a DC 14 Wisdom saving throw or be magically charmed. The charmed creature regards the dryad as a trusted friend to be heeded and protected.

Consequently, what races are from the feywild?

There are some races in the Player's Handbook that have a connection to the Feywild, as the elves, half-elves, and their variants are descended from the fey folk. The Feywild consists of regions called Domains of Delight, which are ruled over by the all-powerful Archfey. What race are archfey? Archfey were fey beings who gained nearly god-like powers and established a position of preeminence among fey-kind. Each archfey had a unique appearance and set of abilities, most controlled a portion of the Feywild and had self-proclaimed titles.

What do archfey look like?

Each archfey has a unique appearance; Relkath of the Infinite Branches looks like a massive black dragon made of bark. Hyrsam the Prince of Fools is a tall, handsome satyr with gazelle horns and a lovely purple & yellow vest. Each archfey lives in a fantastic place that sticks out from the rest of the Feywild. Who is the king of the unseelie court? Arawn the Elder-King Arawn the Elder-King was the king of the faeries of the Unseelie Court before he was slain by one of his heirs, Kieran.

And another question, what are fae courts?

The most common courts from traditional legends are the Seelie or Summer Court, and the Unseelie or Winter Court. The Seelie consists of more benevolent fairies, while the Unseelie consists of more malevolent, demon or goblin-like figures.