Heh. I constantly get smacked right out of Chiffon's kick combos; I've had much better luck with Chocolat for whatever reason.
1. The upper-cut red guys have invincibility and guard-point. Don't try to combo them, they'll just uppercut you (true for either character).
2. The kick-combos have a timing to them to make them true. The "slight delay" is important, you get the hang of the timing once you know it exists. You don't push attack as quickly as possible, there's a bit of a delay between the 3 hits.
3. The running-dash combos don't have any invincibility, but they do have really good / disjointed hitboxes (better than wolft-hitboxes or slime-hitboxes even). Think Marth from Super Smash Bros, really disjointed but almost no invincibility. You gotta space yourself well if you want to take advantage of the combos.
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Blue-hair can just attack+jump / dash-grapple those uppercut guys though for the easy kill. But Red-hair gets 30 to 50 hit combos against groups of enemies, so she can spam her supers much more often.
Blue-hair's bread-and-butter combo of (Soul Calibur notation): 26-attack / 86-attack / 26-attack / 28-attack is mana-free, but has far less disjoint / range than Red-head's hitboxes. (At least, that was the best combo I could find for Blue-hair so far. If anyone else has a better one, I'm all ears)
I guess for Street-fighter notation, that's down-forward-attack / up forward attack / down-forward attack / down-up attack.
The up-forward attack doesn't have a common name (its like a weird, backwards quarter-circle. Very odd for me to do because I don't play Tekken / Soul Calibur that much, the only games I'm aware of that particular input combination...). Red-Head's combo is really close to typical anime fighters (Street Fighter, MvC, Blazblue, Guilty Gear), consiting of a gatling chain, quarter-circle, and flash-kick.
Blue-hair's attacks are less disjoint and closer to her. She does have a lot more power behind those attacks though, but I'm not finding as many opportunities to get 30 to 50 hit combos like red-head.