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RICK & MORTY VS. CTHULHU 4-issue miniseries (Oni, 2022)
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PUNCHLINE SPECIAL #1 (Antarctic Press, 2023)
features a crossover with Camilo Wallace
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IMPOSSIBLE TEAM-UP: IMPOSSIBLE JONES & CAPTAIN LIGHTNING #1 (Scout, May 2023) is billed as a crossover between the titular characters created by Karl Kesel and Tom Grummett respectively, although I can’t find any mention of Captain Lightning outside of this issue.
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TEENAGE MUTANT NINJA TURTLES VS. STREET FIGHTER 5-issue miniseries (IDW, 2023)
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The Transformers' Jetfire appeared in Void Rivals #1, signaling the start of Image/Skybound's Energon shared universe (which will also include G.I. Joe).
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TEENAGE MUTANT NINJA TURTLES X STRANGER THINGS 4-issue miniseries (IDW, 2023)
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Spawn appears in KILLADELPHIA #30 (Image, Apr 2023).
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LOCAL MAN: GOLD (Image, Aug 2023) features appearances by or references to:
Battle Pope
Black Terror
Boof
Chew
Cyberforce
Dynamo 5
Fantomah
Firebreather
the Flame
Hack/Slash
Hexware
Liberator
Lovebunny & Mr. Hell
Love Everlasting
Miss Masque
Prophet
Pyroman
Savage Dragon
Shadowhawk
Street Angel
Wonderman
and a few others I can’t identify
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from The Dandy Annual 2024
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JUSTICE LEAGUE VS. GODZILLA VS. KONG 7-issue series (DC, 2023)
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SANTOS SISTERS HALLOWEEN SPECIAL (Floating World, 2023)
appearances by Cassie Hack and Vlad, Mercy Sparx, and Gutt Ghost
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THE THREE STOOGES: VS. CTHULHU #1 (American Mythology, 2023)
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ACID CHIMP VS. BUSINESS DOG #1 (Ahoy, 2024)
(indicia mistakenly reads “Business Acid Chimp vs. Business Dog”)
crossover between characters from My Bad and Billionaire Island
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BLACK HOPS X KAMEN AMERICA #1 (Antarctic Press, 2024)
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Savage Dragon appears in KILLADELPHIA #32 (Image).
Blacula will appear in #35.
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The NacelleVerse debuted in NACELLEVERSE #0 (Oni, Mar 2024), featuring RoboForce, Biker Mice from Mars, Sectaurs, Power Lords, and the Great Garloo.
TREASURY OF BRITISH COMICS PRESENTS SMASH! (Rebellion, 2023) 3-issue miniseries
In addition to many of the usual suspects (Janus Stark, Spider/King of Crooks, Steel Claw, Robot Archie, Cursitor Doom, Adam Eterno, the Thirteenth Floor) it features what may be the first crossover appearance from Jane Bond.
BATMAN/DYLAN DOG (DC, 2024) 3-issue miniseries
No new links here, but HACK/SLASH: KILL YOUR IDOLS (Image, Mar 2024) features appearances by Superpatriot, Bloodstrike, and Shadowhawk.
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CONAN: THE BARBARIAN FCBD (Titan, 2024) aka Conan: Battle of the Black Stone
features appearances by Robert E. Howard characters James Allison, Solomon Kane, Dark Agnes, El Borak, and John Kirowan
SGT FLAG MEETS TOMORROW GIRL #1 (G-Man Comics, 2024)
Sgt. Flag and the G-Men visit the universes of Advent Comics (Homeland), Gallaverse Comics (Night Sun), Argo Comics (Argo 5), and Antarctic Press (Ninja High School)