Hassan(Cursed Arm) vs Fuuma

In my personal experience, I prefer using Fuuma even though I have both of them and for the longest time had used Hassan in my buster crit teams(still do, but moreso as a backup for Fuuma). Hassan’s evade is very nice making him last quite a while, and they both have very similar star generation rates, I moreso use Fuuma because of his debuffing skills and targetable evade since neither Bryn, Ozy, or many other of my damage dealers have their own evade skill. I recommend looking into both of their set of skills to see which one you’d think you’ll benefit from the most really considering the servants you’ll be using them with.

It depends on your team. Fuuma can give more survivability to another hero. However, hassan hinself is durable. So if you have someone that needs protection, use fuuma. If you find it difficult to keep him alive, hassan. I am pretty sure fuuma actually has better stargen. Shishou is good, but you need more experience playing with her.

Kotarou also has more hits on his quick cards, which makes him the superior star generator. He is also the best budget AoE assassin, not to mention the only servant with targetable evade.

Cursed Arm is certainly decent but his status as a two-star servant means that he is not dealing the damage you need when you get to the higher difficulties. Still, give him a 2030 fragment and he'll make stars for days just by existing.

Scathach assassin is decent. Her low rank of presence concealment means she's an inferior star generator, but really, it's only a difference of about 5 stars or so. Her real issue is that her first two skills don't really do a whole lot which tends to relegate her to a farming role.