Haley was my least used character as well. His physical attacks are not powerful enough, and even though his ESP skills are not bad, they are still weaker than Zhu Zhen whose magic skills are quite good on higher levels. I only leveled him up to be able to complete 10 battles in arena with him, and also see his Ultimate spell.

I think even without 2 last fusions, you can still dish out great damage, if you use the item that gives you 100% hit area on the judgement ring, Monkey Paw and 7th Key in this sequence for Yuri. He will do Crazy damage for a few turns. And if the boss still there, just repeat, you should have few of this items around by the end of the game.

Wow. Glad to see more people here picking this game up, and enjoying it My plan is working