Best tier: Hector, Eliwood
Good tier: Ike, Eirika, Ephraim
Meh tier: Corrin
Bad tier: Robin, Chrom
Awful tier: Lyn
Haven't finished the game yet tier: Sigurd, Seliph, Marth, Roy
Haven't played the game yet tier: Alm, Celica, Leif, Micaiah, Kris
Favorites:
1. Piplup! I could tell you so many heartwarming stories. I love Piplup so much!
2. Glaceon! I have some nice stories with this one too.
3. Ho-oh! I got the plush I have of it in WDW.
4. Roserade! It's beautiful and my little sister was able to hatch a shiny Budew which she evolved into it. (His name is Thornton)
5. Lucario! It's really cool!
Least favorites:
I can't really think of an order. Skrelp, (Dragalge's ok) Binacle, Bibaracle, Muk, Magnezone.