Tower of Wisdom - Levitator w/ Free Characters (Aldo DPS) [LONG CLEAR]

Disclaimer: This boss is very, very long with free characters only, as your only reliable way to deal damage is through Aldo's null attack. While it is technically possible to defeat this boss, I don't really recommend attempting it this way due to the significant time investment required. Using Kaleido characters or other null attackers will make the battle much more manageable.
The only thing you need to take care about is filling your AF every 4 turns and charge Stellar burst enough to survive Levitator attack. Make sure to time Aldo's attack after the character you equip break chance equipment / grasta to double your dps. If you equip serge with an element, make sure it is equipped on the second slot : otherwise, you might end up being absorbed by the boss one way or another.