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Fibonascii Squares

## The Challenge

Your job is to, given input positive non-zero integer $n$, output an ASCII representation of the tiled Fibonacci squares up to the $n$th number of the Fibonacci sequence.

## Rules

Input:

- Input will be an integer $n$ such that $n \gt 0$.

Output:

- Output will be an ASCII representation of the tiled Fibonacci squares, up until the $n$th Fibonacci number.

- For Fibonacci number $x$, its respective square will be $x$ characters tall and $x$ characters wide.

- Squares must be tiled so as to match the arrangement shown in the examples below. However, the output may be mirrored or rotated by multiples of $90^\circ$ as desired.

- This challenge does include $0$ as a member of the Fibonacci sequence, so bear that in mind.

- For cases where $n$ is $1$ (and hence there aren't any squares to create), you may either output any number of whitespace characters or output nothing at all.

- Each square in the output must be represented by a grid made up of a unique ASCII character. For the characters forming your squares, you may use either the alphabet (either uppercase or lowercase, starting at `a`) or the digits 0-9 (starting at `0`). You may reuse characters once you reach the end of the character sequence. You must use at least five unique characters.

- This is a code-golf challenge, so the code with the fewest bytes wins!

## Examples

Here is an image of the proper way to tile Fibonacci squares:

![Fibonacci square arrangement.](https://codegolf.codidact.com/uploads/y7w0yy9iztcgb6eep8jy08llkpky)

<sup>Image source: [Wikipedia](https://en.wikipedia.org/wiki/File:Fibonacci_Squares.svg)</sup>

### Example 1

```
Input:
5
Output:
DDDCC
DDDCC
DDDAB
EEEEE
EEEEE
EEEEE
EEEEE
EEEEE
```

Explanation: The input is $5$, representing the first $5$ numbers of the Fibonacci sequence, which are $0$, $1$, $1$, $2$, $3$, and $5$. The first and second squares are $1 \times 1$ characters in size, and are represented by `A` and `B`, respectively. The third square is $2 \times 2$ characters in size, and is represented by `C`, and so on until we reach the fifth square.

### Example 2

```
Input:
1
Output:
```

Explanation: The input is $1$, representing the first number of the Fibonacci sequence, which is $0$. Thus, nothing is outputted. Alternatively, any number of whitespace characters could be outputted. 

### Example 3

```
Input:
3
Output:
AB
```

Explanation:
The input is $3$, representing the first $3$ numbers of the Fibonacci sequence, which are $0$, $1$, and $1$. Thus, we have two squares, each $1 \times 1$ characters in size. The first square is represented by `A`, the second by `B`.