Niamh's Links
Niamh was loyal to her for a long time- even when he shouldn't have been. He was too scared to go against her and the only person in the world he hates more than her is himself for being a coward.
He'd never especially stood out to her until she realized how close he was with Halia, and she tried to exploit his knowledge of her and her weaknesses. His hesitation led her to question his loyalty- a sore topic after Halia's betrayal. She locked him in with a pact, magically bonding his soul to her so he couldn't disobey her direct commands. This pact had unintended side effects, dragging his soul along through some of their reincarnations before the bond grew weaker with time.
Halia holds a special place in his heart, and is the closest thing he's had to a true family. She was one of the first not to regard him as a burden and to treat him as an equal. He'll never forgive himself for turning against her, but is determined to make things right again.
Halia never cared much for the other Valkyrie... with the exception of Niamh. He did terribly in his division and was thrown onto her in the hopes she could set him straight. She initially thought of it as a burden, but realized Niamh's gentle nature was actually quite refreshing. She helped him come to terms with his duty, and the two of them actively kept in touch during their lives.
The last time Niamh saw Laoise, Halia was using it to cut him down. He managed to get past his negative associations upon meeting the spirit sealed within, and has been found a companion in her that he didn't expect. They have a lot in common, and he often wishes they'd been able to meet when she was still alive... Maybe they both could have avoided their mistakes.
Laoise was hesitant about him at first, but eventually came around to him through their common goal. She's come to care a lot about him, and is sympathetic to his past and the things he's done. Unlike with Halia, she's told him a little bit about her life as Eithne and the things she did under orders to relate to and sympathize with him. She wants to see him get the happy ending through his second chance that she never got.
His feelings towards Chira are fairly neutral, but a little complicated. He'll work with her to protect Halia, but there are times when he sees himself in Chira and it makes him uncomfortable.
She doesn't know Niamh well, but much like her Halia is the only family they feel like they have. They're willing to work together if it means keeping her out of danger but they're not exactly close.