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URs by Center Skill

How to find your most optimal UR center:

Simply take your desired team and count how many members of each type it is comprised of.
Types are group, subunit, and year group: you can see those Types by clicking on a card at the top if you don't know them by heart (highlighted in the screenshot below).

To give a clear example, here's my Smile team.
Here, I have:
9 µ's members
4 3rd year members (Eli and Nico)
4 1st year members (Rin and Maki)
1 2nd year member (Honoka)
6 BiBi members (Eli, Nico, Maki)
2 lily white members (Rin)
1 Printemps member (Honoka)

To know which center skill would be the most optimal, you need to look at which Type (excluding main group) has 5 or more members, as that is the optimal minimum. Here, I have 6 BiBi members which is above 5 and is my highest amount, which means that for my Smile team, a BiBi boost would be the best.

However, another key point is that with 4.0 and the introduction of School Idol Skills, on-attribute center skills (Smile Princess, Pure Angel, Cool Empress) are much, much more efficient than off-attribute center skills. Hence, for each attribute team, it is better to choose an on-attribute center skill along with the secondary boost that fits your team the best.

We've said that for my Smile team, a BiBi boost would be the best, which means I need a Smile Princess BiBi boost: that would be Kunoichi Nico. Hence, when I play Smile songs and want to focus on getting a high score, I will choose Kunoichi Nico as my guest center.

But as you can see, I do not have a Kunoichi Nico in my team, but I have two other URs. In order to find which one is the best as center of my Smile team, simply see the Type counts above: I have a China Dress Nico which is a Smile Princess with a 3rd year boost, and November Maki which is a Smile Princess with a µ's boost.
I have 4 3rd year members, which would be a 4*6=24% boost, whereas the µ's boost would be 9*3=27% boost, hence where the µ's bonus from November Maki is better.
(this simple math is also why at least 5 cards of a Type are required to be more optimal than a group boost: 5*6=30% > 27%)

Use this page to find which cards fit your teams in the most optimal way!

Smile Princess+µ's boost (9/3)
Smile Princess+Aqours boost (9/3)
#66 Initial Nico #79 Initial Honoka #105 Initial Rin
#134 August Nozomi #145 September Umi #187 November Maki
#426 Halloween Hanayo #476 Snowy Mountain Kotori #507 Seven Lucky Gods Eli
#955 Initial Chika #974 Swimsuit Hanamaru #997 Yukata Mari
Smile Princess+1st years boost (9/6)
Smile Princess+2nd years boost (9/6)
Smile Princess+3rd years boost (9/6)
#408 Café Maid Rin #1105 Pyjama Party Rin
#1121 Valentines Yoshiko
#346 June Honoka #980 Pool part2 Honoka
#397 China Dress Nico #1149 Flower Bouquet Nico
#1154 Job Dia
Smile Princess+Printemps boost (9/6)
Smile Princess+lily white boost (9/6)
Smile Princess+BiBi boost (9/6)
#708 Animal2 Honoka
#666 Pool Rin
#692 Kunoichi Nico
Smile Princess+CYaRon! boost (9/6)
Smile Princess+AZALEA boost (9/6)
Smile Princess+Guilty Kiss boost (9/6)
#1110 Haregi Ruby
#1041 Cheerleader Riko
Smile Angel+1st years boost (12/6)
Smile Angel+2nd years boost (12/6)
Smile Angel+3rd years boost (12/6)
#843 Taisho Roman Hanayo
#726 Ball Kotori
#890 Idol Costume Nozomi
Smile Angel+Printemps boost (12/6)
Smile Angel+lily white boost (12/6)
Smile Angel+BiBi boost (12/6)
#265 March Hanayo #315 May Kotori
#531 Valentines Nozomi
Smile Empress+1st years boost (12/6)
Smile Empress+2nd years boost (12/6)
Smile Empress+3rd years boost (12/6)
#608 Magician Maki
#549 White Day Umi
#280 April Eli
Smile Empress+Printemps boost (12/6)
Smile Empress+lily white boost (12/6)
Smile Empress+BiBi boost (12/6)
#782 Circus Umi
#744 Christmas Eli #855 Baseball Maki
Pure Angel+µ's boost (9/3)
Pure Angel+Aqours boost (9/3)
#64 Initial Hanayo #88 Initial Kotori #101 Initial Nozomi
#127 August Nico #165 October Honoka #196 December Eli
#415 Café Maid Umi #456 Constellation Maki #538 Valentines Rin
#957 Initial You #985 Swimsuit Ruby #1007 Yukata Kanan
Pure Angel+1st years boost (9/6)
Pure Angel+2nd years boost (9/6)
Pure Angel+3rd years boost (9/6)
#322 May Hanayo
#378 China Dress Kotori #1002 Pool part2 Kotori
#367 July Nozomi #1046 Birthstone Nozomi
#1100 Haregi Dia
Pure Angel+Printemps boost (9/6)
Pure Angel+lily white boost (9/6)
Pure Angel+BiBi boost (9/6)
#634 Magician Kotori #675 Kunoichi Hanayo
#650 Marine Nozomi
Pure Angel+CYaRon! boost (9/6)
Pure Angel+AZALEA boost (9/6)
Pure Angel+Guilty Kiss boost (9/6)
#1078 Christmas Hanamaru
#1132 Valentines Mari
Pure Princess+1st years boost (12/6)
Pure Princess+2nd years boost (12/6)
Pure Princess+3rd years boost (12/6)
#881 Dancer Rin
#483 Snowy Mountain Honoka
#590 Cyber Nico
Pure Princess+Printemps boost (12/6)
Pure Princess+lily white boost (12/6)
Pure Princess+BiBi boost (12/6)
#833 Taisho Roman Honoka
#272 March Rin
#799 Fairyland Nico
Pure Empress+1st years boost (12/6)
Pure Empress+2nd years boost (12/6)
Pure Empress+3rd years boost (12/6)
#257 February Maki
#214 January Umi
#862 Baseball Eli
Pure Empress+Printemps boost (12/6)
Pure Empress+lily white boost (12/6)
Pure Empress+BiBi boost (12/6)
#965 Little Devil Umi
#581 Job2 Eli #772 Circus Maki
Cool Empress+µ's boost (9/3)
Cool Empress+Aqours boost (9/3)
#73 Initial Umi #94 Initial Eli #126 Initial Maki
#155 September Kotori #172 October Rin #180 November Hanayo
#442 Halloween Nozomi #514 Seven Lucky Gods Nico #600 Cyber Honoka
#956 Initial Riko #1018 Halloween Yoshiko #1030 Halloween Dia
Cool Empress+1st years boost (9/6)
Cool Empress+2nd years boost (9/6)
Cool Empress+3rd years boost (9/6)
#358 July Maki #1073 Pyjama Party Maki
#296 April Umi #1066 Christmas You
#1127 Flower Bouquet Umi
#330 June Eli
Cool Empress+Printemps boost (9/6)
Cool Empress+lily white boost (9/6)
Cool Empress+BiBi boost (9/6)
#643 Marine Umi
#659 Pool Eli #701 Animal2 Maki #1025 Birthstone Eli
Cool Empress+CYaRon! boost (9/6)
Cool Empress+AZALEA boost (9/6)
Cool Empress+Guilty Kiss boost (9/6)
#1053 Cheerleader Chika
#1144 Job Kanan
Cool Princess+1st years boost (12/6)
Cool Princess+2nd years boost (12/6)
Cool Princess+3rd years boost (12/6)
#464 Constellation Rin
#222 January Honoka
#250 February Nico
Cool Princess+Printemps boost (12/6)
Cool Princess+lily white boost (12/6)
Cool Princess+BiBi boost (12/6)
#900 Idol Costume Honoka
#815 Fairyland Rin
#909 Little Devil Nico
Cool Angel+1st years boost (12/6)
Cool Angel+2nd years boost (12/6)
Cool Angel+3rd years boost (12/6)
#556 White Day Hanayo
#565 Job2 Kotori
#203 December Nozomi
Cool Angel+Printemps boost (12/6)
Cool Angel+lily white boost (12/6)
Cool Angel+BiBi boost (12/6)
#761 Christmas Hanayo #871 Dancer Kotori
#733 Ball Nozomi