enemy.rb

class Enemy
  def initialize
    @enemies = {}
  end
  
  def method_missing(method_name, *args)
    enemy = method_name.to_s
    if enemy =~ /=\z/
      @enemies[enemy.chop] = args[0]
    else
      @enemise[enemy]
    end
  end
end

Enemy.new.instance_eval do
  name = "アボ"
  max_power = 1080000000
  puts "name:       #{name}"        # => name:      アボ
  puts "max power:  #{max_power}"   # => max power: 1080000000
end