How to print data from a few arrays

   let katakana = ["フシギダネ","フシギソウ","フシギバナ"]
   let romadzi = ["Fushigidane","Fushigisou","Fushigibana"]
   let number = ["001","002","003"]
    
    for i in 0..<katakana.count
    {
        print("Hi im (katakana[i]), or (romadzi[i]) and my nymber is (number[i])")
    }

A more efficient and reliable way is to create a custom struct. Each instance contains all information about one person.

The description property provides to get the description string with array[i]

struct Person : CustomStringConvertible {
    let katakana, romadzi, number : String
    
    var description : String {
        return "Hi I'm (katakana), or (romadzi) and my number is (number)"
    }
}

let people = [Person(katakana: "フシギダネ", romadzi: "Fushigidane", number: "001"),
              Person(katakana: "フシギソウ", romadzi: "Fushigisou", number: "002"),
              Person(katakana: "フシギバナ", romadzi: "Fushigibana", number: "003")]


print(people[1]) // Hi I'm フシギソウ, or Fushigisou and my number is 002

and to print all

people.forEach{print($0)}