Sorry I haven't commented/followed up I was suffering from deep, sad depression aww yeah. And post Devilman Syndrome. I'm sad. I'm so sad.
Listen I love Bryn to death. She's so pretty.
Anyway I pulled a Brynhildr so I'm basically satisfied as far as wives go.
So Brynhildr gets compared a lot to Scathach. That's not 100% correct, but understandable at the same time. After all they-
1) Almost have identical stats (same HP, Brynhildr has a "whopping" 57 more attack at max + the 100 damage boost from Divinity E)
2) Almost have the same decks. The only difference is Scathach is slightly quick and Bryn is slightly buster due to the NPs.
3) Mamiko Noto Lancers
4) They have a similar skill in Mana Burst and Primeval Rune.
5) If you want to boil them down to a very simplified version of themselves: They are Lancers that focus on critical hits.
That's about where it ends, at least for me. I'm not going to try and be saying one is better then the other, honestly I'd just go for whoever you like more. I'm just going to explain what they do and what roles Bryn could fulfill in your team (if you got her or want to borrow someone's.) That being said I'll bring up - Bryn has a pretty decent NP gain rate. An AQQC will net her around... maybe 41% NP bar? It's not bad, it's not bad...
As for her skills -
Mana Burst (Flame) - Not as good as Karna's and Arjuna's. It's a split Buster and NP buff. Buster starts at 15% buff with an 8% buff to the NP damage. It's kind of unfortunate it wasn't just a flat Buster buff, but we take what we can get (it's not Instinct.) It's kind of about what it sounds - one turn skill to pop and use to amp up damage.
Primeval Rune - Reduces one enemy's NP damage (by 15% at min) for one turn and reduces their Critical chance for 3 turns (by 30%). So uh. This skill could be better. It's not without it's uses though. Honestly I use this semi often but its normally against the same types of enemies - the kinda "mid bosses" you get when grinding, like dragons and the demons. It feels like the AI rigs it so they always crit way more then they should. I like making the chances smaller so I'll often throw one down.
Hero's Bridesmaid - Honestly? Her best and most fun skill. A targetable skill that gives crit weight and healing (1000 hp heal at min 3000 at max). A heal that also makes the target more likely to get critical hits. Bryn herself is a decent star generator and this skill only helps her function better with characters that rely on critical hits. This is absolutely THE skill of her's to level up first. The star absorption lasts for 3 turns.
And then there's her NP.
These characters are important.
Her NP is Brynhildr Romantia, single target Buster NP. 12k damage is the minimum. However, Brynhildr's Beloved is a trait. The characters in that picture above give her an added damage multiplier. This makes her NP hit around... 30k damage. With maxed out Mana Burst it hits around 43k. It's pretty good when you use it on the right target.
The best point of it though is that it gives the entire party critical star generation. With this and her Hero's Bridesmaid skill you can kind of see what she has a niche for.