The nine delves I’ve prepared (and the adventure on which they are based) are as follows:

Acererak’s Last Stand (S1: Tomb of Horrors): Impossible
Erelhei-Cinlu Rises (D1-2-3: The Drow series): Difficult
Giant Problems (G1-2-3: Against the Giants): Easy
The Great Metal Dungeon (S3: White Plume Mountain): Difficult
The Pit of the Queen (Q1: Queen of the Demonweb Pits): Impossible
Return to the Borderlands (B1: The Keep on the Borderlands): Easy
The Ruins at Inverness (C2: The Ghost Tower of Inverness): Medium
Tomoachan’s Treasure (C1: The Hidden Shrine of Tomoachan): Medium
White Plume Mountain Beckons (S2: White Plume Mountain): Difficult

Pregenerated characters (created by @flashedarling) in PDF format.

Cart (Runemind – Hybrid Runepriest/Battlemind) complexity 5
Cikatak (Barbarian) complexity 2
Elaine (Seeker) complexity 2
Isabella (Hexblade) complexity 1
Isaiah (Cleric) complexity 2
Quinn (Mage) complexity 4
Rakash (Knight) complexity 2
Sirocco (Scout) complexity 2
Sly (Psion) complexity 4
Tyrus (Corrupted Paladin – Hybrid Paladin/Warlock) This one has a ton of errors on it, but it’s a neat concept, so you may want to tweak it for use.
Urgar (Warlord) complexity 3
Xerxes (Shaman) complexity 5

If you prefer Character Builder character sheets, I have those. I added backgrounds to all of these characters, so many have an extra power. I gave Cart the background of Alchemist so that he can craft an Alchemist’s Fire after each encounter. He starts with one in hand that should count against his limit for each encounter, but feel free to run this as you please. I’m not the boss of you.

Cart complexity 5
Cikatak complexity 2
Elaine complexity 2
Isabella complexity 1
Isaiah complexity 2
Quinn complexity 4
Rakash complexity 2
Sirocco complexity 2
Sly complexity 4
Urgar complexity 3
Xerxes complexity 5

Pregenerated characters in .dnd4e format.

I tried to upload these to WordPress in Character Builder format (.dnd4e), but WordPress saw through me. They realized that the file was of another type with the extension changed to PDF. So, I’m not sure if I did this correctly, but you should be able to access them here: https://www.dropbox.com/scl/fo/ztl2vj2soz5gm65mgrjxk/APh3SOA6aqwu7duM38QEbZA?rlkey=upk88bzs55tl1nwcrsh1abznx&dl=0.