How to Recruit Goober - Dragon Quest 6
Goober is one of the optional party members that you can recruit to your team in Dragon Quest 6. He is not available in the SNES (original release) of the game; only in the DS and Mobile remakes are you able to recruit him to your party. To recruit Goober to your party you'll need to complete the Slimopolis Side Quest and then speak with him in Slimopolis.
In order to complete the Slimopolis Side Quest you will need to win all 8 ranks of the arena here with one of the Slime members of your party. Typically Kingsley has the easiest time completing this area but Goowain is a good alternative choice since he is so much easier to get.
Once you've finished the side quest speak with Sledge who is the old man standing at the northern tip of the slime arena (pictured above). He will offer to buy Goowain from you, decline all of his offers then agree to help him train a slime and he'll give you Goober.
Vocation Permanent Rewards
These are the passive & permanent rewards that you will get when mastering a Vocation. You'll keep these boosts even when switching to a different Vocation. Once you reach level 5 in every Vocation you'll receive a Gospel Ring from the priest in Alltrades Abbey as well which will allow you to avoid encounters. You do not need to reach level 5 in every Vocation on 1 character, it can be done on multiple characters.
Gladiator: +20 Strength
Armamentalist: +20 MP
Paladin: +20 HP
Sage: +20 MP
Ranger: +20 Agility
Luminary: +15 Style (or 20)
Hero: +40 MP
Dragon: +20 Strength
Liquid Metal Slime: +100 HP