These days I have been watching Kekkaishi and think it is quite a funny anime. The very aspect of the anime is to show rude humorous story between grandfather and grandson. Yoshi the grandson, feels that why should he and Tokine should defeat those monsters and lurking in the site of Karasumori.
The anime is not very stressed on power, but it is more stress on story line, with each event happening in the town, it stresses on the story which is combination of protecting someone he love, to show his generosity or kindness towards some monster, his jealousy towards his brother who Tokine likes.
Overall the children watching this anime, will burst like fire, to do something that they like or want, a target oriented and love triggered motivation.