Definitely worth investment. She's really good against bosses. I got her NP2 last year and have had lots of success with her.

Yes. Bring her to level 80, and enjoy her to the fullest.

I haven't used her myself, just her classic Caster form which is bloody amazing, but she appears to have good skills and a good NP that gets a Rank Up buff in the 7th anniversary. Looks to be well worth the effort for an ST Rider, especially if you have good Arts support like Caster Artoria / Tamamo.

The next year she'll get a NP buff that on NP 3 does more damage (without DMG mod) than kintoki rider or ryouma and probably more than some SSR at Np 2/3 with the DMG mod.

Obviously i'm counting castoria

Even if shes weak or does damage like a wet noodle... that FA is TOTALLY WORTHY!!

Her Awa-awa-awas are cute and she's been my go to single target Rider ever since I max bonded Ushi, Kintoki and Sakamoto.

She's not quite as good as them, nor Mandricardo, but she does well enough, particularly if paired with Castoria.

Useable until Cinder-Eli comes out, or longer, if lizards aren't your thing.

She's crazy strong as long as the enemies don't have debuff immunity.