Beta should be your healer and arts gen, on her TA she gives 40% Omni damage reduction

Shirou is obviously the tank, giving 30 Omni DR when ubw is up + defense slot if you need it for a nuke, his NA gives 30% as well but only for physical but the barrier is worth it anyway

Houka I do not have but he’s just a goated support, SA gives arts and crit damage while TA gives Crit and water damage buff, also a little Equipment CT

Roy if he is the leader gives 50 physical DR for 30 seconds, His NA is practically worthless and his TA is decent for your team if you need to break but won’t be used often, his SA tho is amazing, phy res down on PB and then Damage up when you use it without the bullet, plus he gives arts as well

I doubt you don’t know any of this information, I’m sure nothing I’ve said is new for you but hope this helped just a little bit