Just a side note,  I have not found any completed Hazbin Hotel/Warrior Cat crossover MAPs unfortunately. The videos below are MAP storyboards and some parts that I've found.

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This Animatic below is by Marlynx on YouTube and features Crookedstar and his daughter, Silverstream. They are singing the song More Than Anything from Hazbin Hotel and holy crap it fits them so well.

This honestly made me cry

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This Animatic features Hawkfrost and Tigerstar arguing over Ivypaw, both of them wanting to train her. The MAP isn't finished yet, but it looks cool! It is by iggylikesu

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This MAP part below is actually a part for the one above. It is by AlloAn on YouTube.

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This MAP part is by Amayas Studio on YouTube. It features Tigerstar and Scourge singing Stayed Gone

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This last MAP in progress is Hell Is Forever, featuring Ivypool trying to help the Dark Forest. It is by InK. Mistake on YouTube.

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Here you go MarcusDaKat ! Hope you enjoyed these!