Just because he is unlucky doesn't mean he passed on his unluckiness to you when you rolled him. He in fact has fairly nice stats (like all the other Certain Magical members); and not to mention the useful IMAGINE BREAKER. Guarding units behind him he's a very nice placement for Guard if you don't have it. Most attacks of enemies goes forward and not back so this member is well prepared.
Rolling Certain Magical Slot
-Imagine Breaker: ⛨ (~100% of Touma's ATK) to enemies behind him when attacked in his front)