Since you're picking the irregulars path, you'll want to also level Getter, Comboy Beebop, Votoms, G Gundam and Expelled from paradise units. The Arcadia is godly so level her up and f*** up everyone.
Make sure to check which stages have unique points attached to them and how to get them.
Hikaru is worth leveling always and her boyfriend can become a counter god unit that spams 0 cost attacks that oneshot units.
Z gets a giant f*** you attack near the end, make sure to wake Carlos up, Gunbuster is worth using, Gaogaigar is worth using, especially considering that you're dealing with the second half of the series...
The Unofficial Iron Castle That Smashes Through Mountains of every board in the multiverse. People who got it:6 The Official Tlaloc of the SMT IV board.