Geralt is from The Witcher books and video games. Witchers possess supernatural speed, strength, and agility that can be further enhanced through potions that they are able to make or obtain. He also has an understanding of magic in general and can do basic spells. Enhanced healing and senses and resistance to damage also comes as part of the package.

Zelda is one of the two main protagonists from the Legend of Zelda video game series. She brings to the team, the power of the Tri-Force. She basically is a Light Magician. She can conjure a bow that fires Arrows made of mystical light, she has telepathy, and the Tri-Force itself is a magical balance of Power, Wisdom, and Courage.

Kaladin is from The Stormlight Archive by Brandon Sanderson. One of the best fantasy book series currently going. He is a member of something called the Knights Radiant and explaining their powers would be very tough since it's a combination of things. But the main gist is he's bonded with a Spren which is basically a living sentient version of emotions. This Spren allows him to form weapons and armor from nothing. He also has the ability to basically fly through an ability to manipulate gravity around himself and this also lets him "lash" people to walls/ceilings through the same ability. Check this out for more detailed explanations of the Stormlight powers; Kaladin is a Windrunner - stormlightarchive.fandom.com/wiki/Surgebinding

Annie January/Starlight is from The Boys. She is one of the actual heroes with powers on the show. The Boys is basically what would happen if you give real people powers and you see how absolute power corrupts absolutely. But Starlight is the biggest exception to that rule. She gets powers from light (sunlight or artificial light) and the more power she gets, the more powerful she is. On a team with Zelda, who can harness Light Magic...well, she'd be hitting the upper most limits of her power.

And Captain Jack Harkness from Doctor Who/Torchwood is an immortal time traveling con artist/do-gooding hero. As for powers, beyond the inability to die as even if he explodes or disintegrates, he'll come back because he's a fixed point in time (Doctor Who wonky logic). As for powers, he's got a lot to some degree. Perfect memory, unlimited brain storage, ability to block most mental manipulation, supernatural pheromones...just a wide array of things.