The positive characteristics of the multitasker are, on the one hand, that he starts with +20% damage and, on the other hand, that he can equip a total of 12 weapons at the same time.
This trait is extremely strong, as it gives you a much higher damage potential, of course, and also a lot more control over the entire wave and the enemies around you.
However, so that the whole thing doesn't get too strong, he gets -5% damage for each weapon he has equipped, which is not made up for by the +20% he has from the start.
So the best starting weapon is the stick, as it does +4 damage for each additional stick you equip. This damage bonus also increases as you level up the weapon!
So get as many sticks as possible as quickly as possible and upgrade them so that they receive an immense damage bonus.
Nevertheless, you should still get % damage so that the damage subtracted from the character's negative trait doesn't carry too much weight.
The weapon bonus of the primitive weapons also gives you +15 HP, which means that you don't have to worry so much about the defensive stats for the first few waves, and you can fully concentrate on collecting the weapons.
If you are struggling with too much damage from the enemies, or you are getting hit too often, just go for some extra HP to keep your run safe.
% life drain is also a highly recommended value due to the many attacks of the 12 weapons, since you will regenerate HP very quickly if an opponent manages to get through to you, or you are hit by an attacking opponent.
Some armor is also very useful, as there can be times when you're being charged by an enemy or hit by an attack from a ranged enemy, and you just take less damage as a result.
By successfully completing the run with the character, you unlock the Cleaver weapon.