My person diet for African hornbills consists of:
50% dry pellets (either mazuri softbill, versele-laga nutribird H16, or wisbroek softbill diet large)
25% vegetables (sweet potato, peas, carrots, leafy greens, etc)
15% fruit (apples, blueberries, melon, banana, papaya,etc)
10% protein (super worms, crickets, dubia roaches, mice, quail chicks, or even dog food)
I would only offer protein 3x a week, with the other 4 days compensating with 25% fruit instead, unless its for a breeding pair rearing chicks, in which case they would receive protein every day for the duration of the breeding cycle. I worked with a very successful breeding pair of wrinkled hornbills that would consume COPIOUS amounts of crickets while they were nesting/rearing chicks, but it still only came to around 5% of their diet by weight. The large asians are more predatory, but the africans have a more diverse diet overall, as they tend to include a lot of insects in their diet year round.