Answer:
走 SOU, hashi(ru) - run
秋 SHUU, aki - autumn
シ+少 Katakana "Shi" or The "Sanzui" radical - water / SHOU, suku(nai), suko(shi) - little, few
成 SEI, JO, na(ru), na(su) - become, consist, form
ク+ク+ク+X+口+川+シ+シ Katakana "Ku" or he "Tsutsumigamae" radical - to wrap / Alphabet "X" / KOU, kuchi - mouth / The "Sanbongawa" radical - river / Katakana "Shi" or The "Sanzui" radical - water
They all take the "fish" radical (魚 GYO, sakana, uo - fish) to become other characters.
鯐 subashiri - mullet
鰍 SHUU, kajika - bullhead, sculpin
鯊 SA, hase - goby
鯎 ugui - dace, mud carp
鱲 RYOU , karasumi - tuna eggs, roe