They both sound pretty cool.
Clorinde's ability changes her NAs to electro shots, which grant BoL upon hit. She can't be healed during this time, but any healing is instead converted to additional BoL. Activate the ability again and all BoL is consumed and she performs an empowered thrust attack and heals herself. The burst is just a multi-attack thing, probably similar to Keqing's.
Sounds like Siggy can trap enemies in her bubbles like I hoped. Sounds fun, but likely not very impactful. Otherwise she's a semi-offensive healer that boosts other characters' off-field damage. She will probably be pretty strong and flexible.
Their charged attacks are interesting too. Clorinde dashes and shoots her gun in a fan pattern. Sigewinne seems to shoot homing Hydro missiles as she charges her bow. Will those keep appearing as long as she doesn't fire her arrow? I wonder how important those are to their kits. They're unique regardless.
Clorinde supposedly wants Thundering Fury, so Imma throw all artifacts into that strongbox. Not sure what Siggy wants and I'm lacking a good weapon for her too. Might finally use that pity on the weapon banner for her bow if her banner companion isn't too bad.