Is there an innate handedness to characters in Anima, or is it only something that applies to a specific situation? Here are all the applicable rules I could find on the matter:
Attacks with Additional Weapons
A character may try to add to his offense by wielding a weapon in each hand. If he does so, he may carry out an additional attack while paying a penalty of –40 only for the second weapon. If the combatant is Ambidextrous, the penalty for the second weapon is reduced to a mere –10.
Anima - Beyond Fantasy Pg.84
An ambidextrous person can use both hands equally well.
Effects: An ambidextrous character can perform maneuvers with either hand. In combat, he suffers only –10 to attacks with an additional weapon.
Anima - Beyond Fantasy Pg.15
The first rule reads that the game only cares about an 'offhand' when it is used to make an additional attack without incurring the usual additional action penalty, however the second rule seems to imply that all characters have an innate handedness (possibly needing to be specified at character creation) that if they make any action (action is used synonymously with maneuver in the book) with their off-hand they would suffer this penalty.
The question was brought up by the following situation:
A character has an ability to make multiple additional attacks through a ki technique and wants to distribute those attacks between the weapons in their two hands and finish it off with the additional weapon attack. The question is that if the normal attacks made with their second weapon are all affected by this penalty, or just the last additional one.