Hmm...Naruto, Digimon, and Avatar. Check yes for others traveling with them.

This should be good! Digimon sounds like fun, so that's my first pick. I'll throw Inuyasha in there too to give it some action. Oh, and yeah other characters should travel with them.

Votes:
1) Hellboy
2) Resident Evil
3) Bleach or Blood +

Review: So Far So Good, `nuff said.
Oh yeah, and as to characters going with Willow, or Xander. or a MUCH changed Jenny Calender all as antagonists not allies.

There's just something about the thought of the worst vampires in history ending up in the Digital World that makes laugh, so definitely Digimon. Naruto and FMA would also be really cool. And yes, other characters should go with them, the interactions should be priceless.

Digimon would be funny and it has a wide range. "Adventure", "Tamer", "Frontier", and "Savers Data Squad" in Anime and "V-Tamer", "Chronicle", and "Next" in the Manga. They also allow crossovers.

Spike: Beelzemon. Leather jacket, bad attitude, a couple of shotguns, and his motorcycle, the Behemoth. Rookie: Foulmouth Impmon

Drusilla: Lilithmon. Dressed like a Queen, Goddess of Darkness, and decayed arm covered by lethal claw. Rookie: Kitty BlackGatomon

Angel/Angelus: Gallantmon/ChaosGallantmon or Seraphimon/ShadowSeraphimon. Good version/Evil version.
Others for Angel: MedievalGallantmon and GuardiAngemon

The Scourge should end up in the Ranmaverse. Other characters should join them

I'm going to vote for Digimon simply because I think it would be hilarious for the Scourge of Europe to be surrounded by Digimon or perhaps become Digidestined and I'm going to vote yes for other characters joining them.

Maybe Angel, Spike, and Dru could end up at Yuko's shop from xxxHolic. That's probably a good starting point for traveling across different dimesions. If anyone can send them on a crazy adventure it'd be the Dimension Witch. Anyway, can't wait to see what happens next.