You should unlock the Cursed Fighter in Anime Defenders if you need a powerful unit in your team. He is based on Itadori Yuji, the main character of Jujutsu Kaisen. Cursed Fighter is a Ground-type unit of Legendary rarity. You should use him as a Support unit thanks to his debuff attack aspect. So here is how you can get him and all his stats while leveling him up.
I've collected every secret portal unit in Roblox Anime Defenders
You have to use Summons to unlock him. This is the gacha mechanic of the game and it comes down to luck. But the good news is that it has a pity system. So if you didn’t get him on your first pulls, you are guaranteed to get a Legendary character on your 50th pull. Just make sure that Cursed Fighter is the Legendary character when you are about to hit your Pity or making pulls.
To summon you need Gems. Each summon costs 50x Gems:
As mentioned before, Cursed Fighter can be used as a support unit thanks to its debuff ability. It applies vulnerability to incoming targets, which take 15% more damage when attacked. Here are its stats when deployed and after it reaches max level.