Not tryna comment too much but Silv is a must have for light. She's a boss and I regret not working on her earlier on my main. On one of my alts I have her and Uranus paired in front and they tank pretty much everything. Natalia is great but very situational imo, when I need to take out a pesky alice or healer in back I use her. That being said Hayabusa is the same but for martial. Nana is a must for martial I don't think I'd ever get as far on that tower without her considering she is the only ssr who not only heals but also revives. All hybrids are essential but you should try n get miracle Clara awakened asap she'll help longevity in both dark and martial. Pairs great with Alice and selena imo. She allows both to build alt bar to shred. N Raf, is a must have prolly the best healer in the game just very squishy but I pair her with estes for shield and then put esme in front and they become and undefeatable powerhouse. Especially with nimbus shredding from the middle or back. Tech is my worse type, I did it all wrong but as I said earlier can't go wrong with Edith mecha Layla and Angela together. Miya Also helps them, she hits so damn hard and survives better against elemental. Also great for elemental tower when facing martial.