Kingdom Hearts vs Bleach
Connection:
Both are spiky redhead, hot heads who are not human but appear human (Nobody and Soul Reaper respectively) who are apart of organizations which has the number 13 in it (Organization XIII and Gotei 13)
Both have a unique weapon to their universe (Keyblade and Shiki &Bankai, respectively)
Both also started off as an antagonistic for to the series' main protagonists (Sora and Ichigo Kurosaki respectively) before joining them
Both have long term relationships with fellow members (Roxas, Xion and Saix for Axel & Rukia Kuchiki for Renji), but major villains used them and their friends for their own gain (Xemnas and Sosuke Aizen respectively) so they join the protagonist to help stop them, both eventually got their friends back and made amends with them
