Lavos is special. The more you look at him, the more you like him. However, his huge problem are colors and what they die. Hydroid P, Vauban P and Harrow P share the same issue imo.
As for hideous designs, Caliban (I don't mind asymmetry, and I like sentinels, but Cal fails miserably at both), Ember, Frost P, Hydroid, Khora's Deluxe, Valk's Deluxe, Garuda's Deluxe, Nova's Asuri,