What are the different unit types and what do they do?

Types determine the stat progression of your unit. Unit type might change randomly with a small chance each time a unit evolves. 

• LORD: All stats progress evenly from base stats.
• ANIMA: HP increased by a certain %, REC reduced by a certain %.
• BREAKER: ATK increased by a certan %, DEF reduced by a certain %.
• GUARDIAN: DEF increased by a certain %, ATK reduced by a certain %.
• ORACLE: REC increased by a certain %, HP reduced by a certain %.

Tip: Regardless of a unit type obtained from summon or random drop, things to consider is equipping a unit with a specific Elgif in order to balance the reduction given by that unit type.