Learn how affinity works in Umamusume: Pretty Derby to boost stat inheritance and bonuses and secure better training outcomes.

The Career Mode in Umamusume: Pretty Derby begins by selecting a trainee, along with her support cards and Legacies. Both these selections are crucial for the trainee’s performance, as they provide bonuses to her stats and skills. Legacies, also known as parents, are uma who pass down various bonuses to the trainee according to their affinity. At first, affinity may seem like an opaque concept to wrap your head around, but this article will simplify its workings and benefits.
How Affinity Works in Umamusume: Pretty Derby

Affinity is the compatibility score that determines how likely it is for the Legacies (parents) to pass on their skill and stat bonuses to the trainee in Career Mode. Affinity depends on the type of parents you select, factoring in their stats, running style, event distance, and the type of races that they win. The version of the character, whether it is seasonal or base, does not make a difference.
Both Legacies will add their own stat bonuses to the trainee. These appear in blue and pink text above the main uma’s stats. The blue text represents the bonus from the left parent, and the pink text represents the bonus from the right parent. The values highlighted in yellow are the aptitudes being improved by the Legacies and their affinity.
How To Get a Better Affinity Score in Umamusume: Pretty Derby

Depending on the affinity score, the legacy selection menu will display one of three affinity ranks. From best to worst, the three affinity ranks are:
1) Double-O (◎)
2) Circle (O)
3) Triangle (△)
Each of these ranks represents a range, and the exact affinity number remains hidden. These values are calculated by comparing the Legacies’ and Sub-Legacies’ stats, running style, and track length preference with the trainee’s. The more they have in common, the better the score. Sub-legacies refer to the legacies of the horse-girls themselves or the trainee’s grandparents.
In simpler terms, if the track length preferences of both Legacies and the trainee match, there is a good chance that you will get the best affinity score, which is double-O. Therefore, while starting a career for a long-distance runner trainee, pick both Legacies with high scores for long-distance running for a high affinity score.
What are the Benefits of Affinity in Umamusume: Pretty Derby?
Having high affinity provides several advantages to your trainee. Starting off an uma’s training with a good affinity rank is the second most important advantage you can give her after support cards. The benefits of a good affinity rank include:
- Initial stat and skill bonuses from sparks.
- Additional sparks unlock during inspiration events, which lead to further stat bonuses and skill additions

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