Lances work in different ways to spears, except for their thrust. Spears can be used more versatilely, whereas lances are more fixated. Glaives wouldn't be an impossible weapon to exist though. They might not have been mentioned or seen since a lot was skipped over. However, there was for a fact that Agil used a Halberd (I think) or Battle Axe of sorts. These two are similar polearms, unlike spears, which are generally classified as a separate type of weapon.
Spear --> Lance
But Also
Polearm--> Lance
Too variable
Too many possiblities
With your stat specs
I mean, sure, 9 str and 19 agi isn't a great start for a tank, however, if you go with the next 10 levels with strength, it would balance quite nicely
I don't think there was anything with shields really, just a higher shield skill meant greater reduced damage when guarding. I don't think there were any shield bash skills, I think that would just be a non-system attack, which may damage slightly and push enemies away.