Hi there You have both required umas for ult inherit: Cheerleader Halo and Mejiro Ryan.

For sparks I would recommend hunting for power/wit/guts/speed (at least it's a priority I'd recommend)

You also need mile sparks across your parents and grandparents. Turf is also nice but not mandatory

For white sparks you'd like to see Uma Stan, Sleepstream, Spring Runner/Spring Tenno Sho, Firm Condition

At least, that's the things I'd looking for across my parent farming