Let's be honest, there are more fan fictions than you'd probably expect that are Bleach and Marvel crossovers. One thing that is notable about so many of these crossovers, however, is that Ichigo is usually female. I'd prefer it if he stayed male. Another thing is that there is a relatively popular one shipping a male Ichigo with Tony, which is also something kind of hard to ignore when you're just reading these for the powers and plot rather than romance. There is one called Foreign Recruit that had the right ide, but unfortunately it would appear to be abandoned. Again, I'd prefer for this to be a post TYBW Ichigo with both Hollow Zangetsu (Shiro) and Quincy Zangetsu (Juha Bach). Muramasa and the Hogyoku are optional, as is control over the Hell gate. Don't make him weaker than he should be; power scale him so that he is stronger than all of the Avengers, and able to go toe to toe with Thanos but not outright beat him, that is assuming that the fan fiction makes it that far without being abandoned. Also make sure Thor says strong and gets stronger; do not let fat Thor happen, and do not go though all of the Endgame shenanigans. Just have them win the first place, if possible. I understand I may be asking for too much, but these are my personal requests; no one has any obligation to fulfill them, and I am well aware of that.