can you make the letters a little bit bigger i cant see them clearly.. xD i am joking... depends on what teams are you using!

It all depends on how u want your team to go. If you feel like you can attak your enemez and kill them quicly, use an attak based team. However, if you feel like at least one healer needs to be in your team, use a healing besed team. But you'd need 2 make sure your healer has sum good attak power 2, depending on who it is.

If you feel that your lineup is very squishy or you want to remove cc then you could use a healer, but if you just want to buff all your ninjas to the max and end them in round 1 or 2, then you probably dont need one.

are you faster then most of your opponents and can you kill1-2 ninjas round 1? dont use one

are you slower and need to survive the opponent attacks, clear debuffs before you can do any significant damage? in this case use at least 1

it doesnt need to be a healer, it can be a support character like iruka that gives high shields, or danzu that can chaos, or even fire main with shield plus immunity to debuffs and so on.