Majidonga is similar to Dodonga, but stronger, more durable, and with an extra attack. See the "Majidonga" page for further details. The fog makes Majidonga harder to see, but even if it's further away, you can still make out a faint outline. Your Patapons can attack as normal, and if Majidonga is far away, it probably won't hit you with its attacks, so the fog is the only real hindrance if you want to begin attacking the boss (i.e. while it's sleeping) from a certain distance. If you really need to see the beast, Tailwind or Rain Miracles will dispel the fog for a while, with the latter also decreasing the effectiveness of the boss' fire attacks.