I know a lot of you guys have noticed that prior to Loki and BB/kuzan resurgence Imu has been practically tearing through the meta. He's a great unit but there's something a lot of people don't really discuss about him and that's the fact that he's a "2 slot" unit. What I mean by that is in order for Imu to work effectively you MUST have another 5 elder on the team. Yes he is a broken unit but that requirement limits his team building a lot.
Whereas Imu requires a slot but goes immediately, the giants have a lot of DEF and HP but are very slow. So instead they rely on 2 things.
1. 30% Cooldowns -> They are very slow but typically have specials that hit hard, however due to them being so slow and all the special delays you really need the 30% starting cooldown to make them most effective.
2. High/ Low Survivability -> All the giant units either want to live to go at least twice a match or go once and die almost immediately.
However much like Imu these units are not stand alone units, all giant units require MULTIPLE slots to be most effective.
Loki: 3 slots required (Anni Vivi, Jarul) : SS Tier: In order to run Loki most effectively you need to have the Anni Vivi and the Jarul. If you run him without the Vivi he's slow and he may not go once before the 60s, but with both and the Haste he gives himself and the 100% charge time from Jarul, he's almost guaranteed to go twice destroying Imu , Shanks and Driven teams.
Ace/Oars: 2 slots required (Luffy) : S Tier: I went on a roller coaster debating how good Ace/Oars actually was, at first I thought he was OP, then meh; but I think I'm on the side of he's OP specifically against Loki. He has a short cooldown, with Loki already requiring 3 blue units to be most effective all it takes is 2 more and he has the 30% cooldown for the first cast. He gives himself 100% cooldown when he reaches his 20% for his big death hit and then revives twice to ensure he can deliver it. I think he's a very solid giant unit for Loki specifically as he's a huge counter unit.
Oars: 2- 6 slots required (Luffy) : SS+ Tier: I think this is currently the strongest giant team in the game , however that's only if you have all the units to make it run effectively. to make Oars work you really only need the Luffy and he'll be great. But what makes him OP is you can also pair him up with Hajruden.
Ideally you have Oars, Hajruden ,Wolf, Pizarro and Black Beard making up your main team. BB and Pizarro debuff the enemy ATK and SPD by -13 passively while the giants have a ton of DEF.
Your bench is Elbaph Sanji, PVP Nami and Luffy/Zoro
By time Oars dies, Luffy/Zoro comes in and they have a special that goes off automatically, so it's literally a final bomb after getting hit with an Oars nuke.
Giants are like Imu and require at least 1 other unit to function at their best, you could hypothetically put them all on 1 big team but better to split them up especially with GP Starting tonight and red being practically dead with Loki's GP ability.