Blake said, "Could you share me more and ideas to help my hugelkultur garden more suitable to native creatures and native flora for generations to come?
If I were creating a hugelkultur garden especially for butterflies and other pollinators I would try to start with perennial native flowers and herbs.
How large are you planning for this garden?
I would like to suggest starting with Creeping Thyme, Thymus praecox which is a perennial that is usually recommended as a ground cover. I feel this will help hold the soil on the sides of the hugel. Creeping time comes in a variety of colors.
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Joe Pye Weed is a taller growing perennial that would be good for the top of the garden bed.
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Another good perennial would be Purple Coneflowers (Echinacea purpurea):
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Some hostas and native annuals would be good to fill in and add more cover. My favorite is Firewheel or Blanket Flower:
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This thread might give you more suggestions:
https://permies.com/t/61605/Creating-Edible-Medicinal-Garden-Butterflies