Method to Acquire - Starts with you on Chapter 8 in a locked room with a crack in the wall. Make sure that you keep moving her to the one square that the Archer outside can't reach her in. Also, make sure to have Roy talk to her to give her a Thunder spellbook for free.
Damage - Lilina will be doing loads of damage since she MAXES magic very quickly.
Critical - At least 20 early on and it should become around 30 later on. Her first support with Roy takes around two turns to get. He criticals have often saved me.
Speed - In the beginning, she obviously won't be hitting twice. Later on, she will be hitting twice on many enemies. Not those evil 18 speed Mercenaries on Hard Mode though.
Dodge - She has an average dodge of 63 as a level 20 Sage which is alright, and most enemies probably won't make it to her anyways.
Growth Rates
HP - 45%
Magic - 75%
Skill - 20%
Speed - 35%
Defense - 10%
Resistence - 35%
Luck - 50%
Average Level 20 Sage Lilina
HP - 36
Magic - 30
Skill - 16
Speed - 20
Defense - 7
Resistence - 22
Luck - 23
Total - 154
Supports
Roy - 1/?15/20 turns
Bors - 15/30/40 turns
Wendy - 15/30/40 turns
Barth - 15/30/40 turns
Ojay - 25/30/40 turns
Gonzales - 15/30/40 turns
Marcus - 59/60/80 turns
Garret - 25/30/40 turns
Astol - 15/30/40 turns
Cecilia - 10/60/80 turns
Rating: 8.75/10. She may be the best in Normal Mode, but Lugh comes first and has high speed and skill while Hugh comes last but has exceptional stats.