Ok, so I'm going with both Raiden and sam (both with murasama) the 50 crusaders (25 with swords and shields and the other 25 with claymores) Sylveon, Glaceon, and Espeon
So first I have glaceon make an ice platform, then espeon lifts it up into the air with its powers, on the platform I have the 25 Crusaders with the claymores for protection in case we need to land.
So I would have Raiden and Sam on the ground with the other Crusaders, characters like headcrabs, crewmates, and most of the payday police for the crusaders, well Sam would deals with combined soldiers, Dr. Bright, and Connor.
Well, Raiden holds off Gordon Freeman and Barney Calhoun, once Sam is done I have him help Raiden, Once both Raiden and Sam are done I'll have them destroy the blade wolfs and trerraria golems.
If some of the 25 crusaders on the ground are done with most of the characters they're dealing with I would send some of them to help Sam and Raiden, if/once the rest are done I send the rest to support the others.
Once Sam, Raiden, and the crusaders are done they will go after the last few waves of payday police, after they're done with I have espeon take us down, once we are down I'll have Sylveon heal wounded in a make building that's been maybe by ice from Glaceon and have 20 of the crusaders support the rest with 5 staying behind for protection.
Now I have all forces attack Dio, Von, and his soldiers which Raiden and Sam should be able to do most of the damage. And that's my strategy.