AsciiRunAnimation.cs

using System;
using System.Threading;

int frame = 0;
string[] frames = new[]
{
	@"   O   " + '\n' +
	@"   |_  " + '\n' +
	@"   |>  " + '\n' +
	@"  /|   ",
	// 1
	@"   O   " + '\n' +
	@"  <|L  " + '\n' +
	@"   |_  " + '\n' +
	@"   |/  ",
	// 2
	@"   O   " + '\n' +
	@"  L|L  " + '\n' +
	@"   |_  " + '\n' +
	@"  /  | ",
	// 3
	@"  _O   " + '\n' +
	@" | |L  " + '\n' +
	@"   /─  " + '\n' +
	@"  /  \ ",
	// 4
	@"  __O  " + '\n' +
	@" / /\_ " + '\n' +
	@"__/\   " + '\n' +
	@"    \  ",
	// 5
	@"   _O  " + '\n' +
	@"  |/|_ " + '\n' +
	@"  /\   " + '\n' +
	@" /  |  ",
	// 6
	@"    O  " + '\n' +
	@"  </L  " + '\n' +
	@"   \   " + '\n' +
	@"   /|  ",
};

while (!Console.KeyAvailable || Console.ReadKey(true).Key is not ConsoleKey.Escape)
{
	frame = (frame + 1) % frames.Length;
	Console.CursorVisible = false;
	Console.SetCursorPosition(0, 0);
	Console.Write(frames[frame]);
	Thread.Sleep(TimeSpan.FromMilliseconds(66));
}